content/browser/renderer_host/render_widget_host_view_aura.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/render_widget_host_view_aura.h"

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/string_number_conversions.h"
#include "content/browser/renderer_host/backing_store_skia.h"
#include "content/browser/renderer_host/image_transport_client.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/web_input_event_aura.h"
#include "content/common/gpu/client/gl_helper.h"
#include "content/common/gpu/gpu_messages.h"
#include "content/port/browser/render_widget_host_view_port.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_switches.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebCompositionUnderline.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/tooltip_client.h"
#include "ui/aura/client/window_types.h"
#include "ui/aura/env.h"
#include "ui/aura/event.h"
#include "ui/aura/monitor.h"
#include "ui/aura/monitor_manager.h"
#include "ui/aura/root_window.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/base/gestures/gesture_recognizer.h"
#include "ui/base/hit_test.h"
#include "ui/base/ime/input_method.h"
#include "ui/base/ui_base_types.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/compositor/compositor.h"
#include "ui/gfx/compositor/layer.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/skia_util.h"

using content::BrowserThread;
using content::RenderWidgetHost;
using content::RenderWidgetHostImpl;
using content::RenderWidgetHostView;
using WebKit::WebTouchEvent;

namespace {

// In mouse lock mode, we need to prevent the (invisible) cursor from hitting
// the border of the view, in order to get valid movement information. However,
// forcing the cursor back to the center of the view after each mouse move
// doesn't work well. It reduces the frequency of useful mouse move messages
// significantly. Therefore, we move the cursor to the center of the view only
// if it approaches the border. |kMouseLockBorderPercentage| specifies the width
// of the border area, in percentage of the corresponding dimension.
const int kMouseLockBorderPercentage = 15;

// When accelerated compositing is enabled and a widget resize is pending,
// we delay further resizes of the UI. The following constant is the maximum
// length of time that we should delay further UI resizes while waiting for a
// resized frame from a renderer.
const int kResizeLockTimeoutMs = 67;

ui::TouchStatus DecideTouchStatus(const WebKit::WebTouchEvent& event,
                                  WebKit::WebTouchPoint* point) {
  if (event.type == WebKit::WebInputEvent::TouchEnd &&
      event.touchesLength == 0)
    return ui::TOUCH_STATUS_QUEUED_END;

  return ui::TOUCH_STATUS_QUEUED;
}

void UpdateWebTouchEventAfterDispatch(WebKit::WebTouchEvent* event,
                                      WebKit::WebTouchPoint* point) {
  if (point->state != WebKit::WebTouchPoint::StateReleased)
    return;
  --event->touchesLength;
  for (unsigned i = point - event->touches;
       i < event->touchesLength;
       ++i) {
    event->touches[i] = event->touches[i + 1];
  }
}

bool CanRendererHandleEvent(const aura::MouseEvent* event) {
  if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED)
    return false;

#if defined(OS_WIN)
  // Renderer cannot handle WM_XBUTTON events.
  switch (event->native_event().message) {
    case WM_XBUTTONDOWN:
    case WM_XBUTTONUP:
    case WM_XBUTTONDBLCLK:
    case WM_NCXBUTTONDOWN:
    case WM_NCXBUTTONUP:
    case WM_NCXBUTTONDBLCLK:
      return false;
    default:
      break;
  }
#endif
  return true;
}

// Creates a content::GLHelper for the given compositor.
content::GLHelper* CreateGLHelper(ui::Compositor* compositor) {
  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
  WebKit::WebGraphicsContext3D* context =
      factory->GetSharedContext(compositor);
  DCHECK(context);
  WebKit::WebGraphicsContext3D* context_for_thread =
      factory->AsContextFactory()->CreateOffscreenContext(compositor);
  DCHECK(context_for_thread);
  return new content::GLHelper(context, context_for_thread);
}

void GetScreenInfoForWindow(WebKit::WebScreenInfo* results,
                            const aura::Window* window) {
  aura::MonitorManager* monitor_manager =
      aura::Env::GetInstance()->monitor_manager();
  const aura::Monitor* monitor = window ?
      monitor_manager->GetMonitorNearestWindow(window) :
      monitor_manager->GetMonitorAt(0);

  const gfx::Size size = monitor->size();
  results->rect = WebKit::WebRect(0, 0, size.width(), size.height());
  results->availableRect = results->rect;
  // TODO(derat): Don't hardcode this?
  results->depth = 24;
  results->depthPerComponent = 8;
  int default_dpi = monitor->GetDeviceScaleFactor() * 160;
  // TODO(fsamuel): This is a temporary hack until Monitor code is complete.
  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
  if (command_line.HasSwitch(switches::kDefaultDeviceScaleFactor)) {
    int default_device_scale_factor;
    base::StringToInt(command_line.GetSwitchValueASCII(
                          switches::kDefaultDeviceScaleFactor),
                      &default_device_scale_factor);
    default_dpi = default_device_scale_factor * 160;
  }
  results->verticalDPI = default_dpi;
  results->horizontalDPI = default_dpi;
}

}  // namespace

// We have to implement the WindowObserver interface on a separate object
// because clang doesn't like implementing multiple interfaces that have
// methods with the same name. This object is owned by the
// RenderWidgetHostViewAura.
class RenderWidgetHostViewAura::WindowObserver : public aura::WindowObserver {
 public:
  WindowObserver(RenderWidgetHostViewAura* view) : view_(view) {}
  virtual ~WindowObserver() {}

    // Overridden from aura::WindowObserver:
  virtual void OnWindowRemovingFromRootWindow(aura::Window* window) OVERRIDE {
    view_->RemovingFromRootWindow();
  }

 private:
  RenderWidgetHostViewAura* view_;

  DISALLOW_COPY_AND_ASSIGN(WindowObserver);
};

class RenderWidgetHostViewAura::ResizeLock :
    public base::SupportsWeakPtr<RenderWidgetHostViewAura::ResizeLock> {
 public:
  ResizeLock(aura::RootWindow* root_window, const gfx::Size new_size)
      : root_window_(root_window),
        new_size_(new_size),
        compositor_lock_(root_window_->GetCompositorLock()) {
    root_window_->HoldMouseMoves();

    BrowserThread::PostDelayedTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&RenderWidgetHostViewAura::ResizeLock::CancelLock,
                   AsWeakPtr()),
        base::TimeDelta::FromMilliseconds(kResizeLockTimeoutMs));
  }

  ~ResizeLock() {
    CancelLock();
  }

  void UnlockCompositor() {
    compositor_lock_ = NULL;
  }

  void CancelLock() {
    if (!root_window_)
      return;
    UnlockCompositor();
    root_window_->ReleaseMouseMoves();
    root_window_ = NULL;
  }

  const gfx::Size& expected_size() const {
    return new_size_;
  }

 private:
  aura::RootWindow* root_window_;
  gfx::Size new_size_;
  scoped_refptr<aura::CompositorLock> compositor_lock_;

  DISALLOW_COPY_AND_ASSIGN(ResizeLock);
};

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, public:

RenderWidgetHostViewAura::RenderWidgetHostViewAura(RenderWidgetHost* host)
    : host_(RenderWidgetHostImpl::From(host)),
      ALLOW_THIS_IN_INITIALIZER_LIST(window_(new aura::Window(this))),
      is_fullscreen_(false),
      popup_parent_host_view_(NULL),
      popup_child_host_view_(NULL),
      is_loading_(false),
      text_input_type_(ui::TEXT_INPUT_TYPE_NONE),
      can_compose_inline_(true),
      has_composition_text_(false),
      current_surface_(0),
      paint_canvas_(NULL),
      synthetic_move_sent_(false),
      needs_update_texture_(false) {
  host_->SetView(this);
  window_observer_.reset(new WindowObserver(this));
  window_->AddObserver(window_observer_.get());
  aura::client::SetTooltipText(window_, &tooltip_);
  aura::client::SetActivationDelegate(window_, this);
}

RenderWidgetHostViewAura::~RenderWidgetHostViewAura() {
  if (!shared_surface_handle_.is_null()) {
    ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
    factory->DestroySharedSurfaceHandle(shared_surface_handle_);
    factory->RemoveObserver(this);
  }
  window_->RemoveObserver(window_observer_.get());
  UnlockMouse();
  if (popup_type_ != WebKit::WebPopupTypeNone) {
    DCHECK(popup_parent_host_view_);
    popup_parent_host_view_->popup_child_host_view_ = NULL;
  }
  aura::client::SetTooltipText(window_, NULL);
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, RenderWidgetHostView implementation:

void RenderWidgetHostViewAura::InitAsChild(
    gfx::NativeView parent_view) {
  window_->Init(ui::LAYER_TEXTURED);
  window_->SetName("RenderWidgetHostViewAura");
}

void RenderWidgetHostViewAura::InitAsPopup(
    RenderWidgetHostView* parent_host_view,
    const gfx::Rect& pos) {
  popup_parent_host_view_ =
      static_cast<RenderWidgetHostViewAura*>(parent_host_view);
  popup_parent_host_view_->popup_child_host_view_ = this;
  window_->SetType(aura::client::WINDOW_TYPE_MENU);
  window_->Init(ui::LAYER_TEXTURED);
  window_->SetName("RenderWidgetHostViewAura");

  window_->SetParent(NULL);
  SetBounds(pos);
  Show();
}

void RenderWidgetHostViewAura::InitAsFullscreen(
    RenderWidgetHostView* reference_host_view) {
  is_fullscreen_ = true;
  window_->SetType(aura::client::WINDOW_TYPE_NORMAL);
  window_->Init(ui::LAYER_TEXTURED);
  window_->SetName("RenderWidgetHostViewAura");
  window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
  window_->SetParent(NULL);
  Show();
  Focus();
}

RenderWidgetHost* RenderWidgetHostViewAura::GetRenderWidgetHost() const {
  return host_;
}

void RenderWidgetHostViewAura::DidBecomeSelected() {
  host_->WasRestored();
}

void RenderWidgetHostViewAura::WasHidden() {
  host_->WasHidden();
}

void RenderWidgetHostViewAura::SetSize(const gfx::Size& size) {
  SetBounds(gfx::Rect(window_->bounds().origin(), size));
}

void RenderWidgetHostViewAura::SetBounds(const gfx::Rect& rect) {
  if (window_->bounds().size() != rect.size() &&
      host_->is_accelerated_compositing_active()) {
    resize_locks_.push_back(make_linked_ptr(
        new ResizeLock(window_->GetRootWindow(), rect.size())));
  }
  window_->SetBounds(rect);
  host_->WasResized();
}

gfx::NativeView RenderWidgetHostViewAura::GetNativeView() const {
  return window_;
}

gfx::NativeViewId RenderWidgetHostViewAura::GetNativeViewId() const {
  return static_cast<gfx::NativeViewId>(NULL);
}

gfx::NativeViewAccessible RenderWidgetHostViewAura::GetNativeViewAccessible() {
  NOTIMPLEMENTED();
  return static_cast<gfx::NativeViewAccessible>(NULL);
}

void RenderWidgetHostViewAura::MovePluginWindows(
    const std::vector<webkit::npapi::WebPluginGeometry>& moves) {
  // We don't support windowed plugins.
}

void RenderWidgetHostViewAura::Focus() {
  window_->Focus();
}

void RenderWidgetHostViewAura::Blur() {
  window_->Blur();
}

bool RenderWidgetHostViewAura::HasFocus() const {
  return window_->HasFocus();
}

void RenderWidgetHostViewAura::Show() {
  window_->Show();
}

void RenderWidgetHostViewAura::Hide() {
  window_->Hide();
}

bool RenderWidgetHostViewAura::IsShowing() {
  return window_->IsVisible();
}

gfx::Rect RenderWidgetHostViewAura::GetViewBounds() const {
  return window_->GetScreenBounds();
}

void RenderWidgetHostViewAura::UpdateCursor(const WebCursor& cursor) {
  current_cursor_ = cursor;
  UpdateCursorIfOverSelf();
}

void RenderWidgetHostViewAura::SetIsLoading(bool is_loading) {
  is_loading_ = is_loading;
  UpdateCursorIfOverSelf();
}

void RenderWidgetHostViewAura::TextInputStateChanged(
    ui::TextInputType type,
    bool can_compose_inline) {
  if (text_input_type_ != type || can_compose_inline_ != can_compose_inline) {
    text_input_type_ = type;
    can_compose_inline_ = can_compose_inline;
    GetInputMethod()->OnTextInputTypeChanged(this);
  }
}

void RenderWidgetHostViewAura::ImeCancelComposition() {
  GetInputMethod()->CancelComposition(this);
  has_composition_text_ = false;
}

void RenderWidgetHostViewAura::DidUpdateBackingStore(
    const gfx::Rect& scroll_rect, int scroll_dx, int scroll_dy,
    const std::vector<gfx::Rect>& copy_rects) {
  if (!window_->IsVisible())
    return;

  if (needs_update_texture_)
    UpdateExternalTexture();

  gfx::Rect clip_rect;
  if (paint_canvas_) {
    SkRect sk_clip_rect;
    if (paint_canvas_->sk_canvas()->getClipBounds(&sk_clip_rect))
      clip_rect = gfx::SkRectToRect(sk_clip_rect);
  }

  if (!scroll_rect.IsEmpty())
    SchedulePaintIfNotInClip(scroll_rect, clip_rect);

  for (size_t i = 0; i < copy_rects.size(); ++i) {
    gfx::Rect rect = copy_rects[i].Subtract(scroll_rect);
    if (rect.IsEmpty())
      continue;

    SchedulePaintIfNotInClip(rect, clip_rect);
  }
}

void RenderWidgetHostViewAura::RenderViewGone(base::TerminationStatus status,
                                              int error_code) {
  UpdateCursorIfOverSelf();
  Destroy();
}

void RenderWidgetHostViewAura::Destroy() {
  // Beware, this function is not called on all destruction paths. It will
  // implicitly end up calling ~RenderWidgetHostViewAura though, so all
  // destruction/cleanup code should happen there, not here.
  delete window_;
}

void RenderWidgetHostViewAura::SetTooltipText(const string16& tooltip_text) {
  tooltip_ = tooltip_text;
  aura::RootWindow* root_window = window_->GetRootWindow();
  if (aura::client::GetTooltipClient(root_window))
    aura::client::GetTooltipClient(root_window)->UpdateTooltip(window_);
}

void RenderWidgetHostViewAura::SelectionBoundsChanged(
    const gfx::Rect& start_rect,
    const gfx::Rect& end_rect) {
  if (selection_start_rect_ == start_rect && selection_end_rect_ == end_rect)
    return;

  selection_start_rect_ = start_rect;
  selection_end_rect_ = end_rect;

  GetInputMethod()->OnCaretBoundsChanged(this);
}

BackingStore* RenderWidgetHostViewAura::AllocBackingStore(
    const gfx::Size& size) {
  return new BackingStoreSkia(host_, size);
}

bool RenderWidgetHostViewAura::CopyFromCompositingSurface(
    const gfx::Size& size,
    skia::PlatformCanvas* output) {
  ui::Compositor* compositor = GetCompositor();
  if (!compositor)
    return false;

  ImageTransportClient* container = image_transport_clients_[current_surface_];
  if (!container)
    return false;

  if (!output->initialize(size.width(), size.height(), true))
    return false;

  if (!gl_helper_.get())
    gl_helper_.reset(CreateGLHelper(compositor));

  unsigned char* addr = static_cast<unsigned char*>(
      output->getTopDevice()->accessBitmap(true).getPixels());
  return gl_helper_->CopyTextureTo(container->texture_id(),
                                   container->size(),
                                   size,
                                   addr);
}

void RenderWidgetHostViewAura::AsyncCopyFromCompositingSurface(
    const gfx::Size& size,
    skia::PlatformCanvas* output,
    base::Callback<void(bool)> callback) {
  base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
  ui::Compositor* compositor = GetCompositor();
  if (!compositor)
    return;

  ImageTransportClient* container = image_transport_clients_[current_surface_];
  if (!container)
    return;

  if (!output->initialize(size.width(), size.height(), true))
    return;

  if (!gl_helper_.get())
    gl_helper_.reset(CreateGLHelper(compositor));

  scoped_callback_runner.Release();
  unsigned char* addr = static_cast<unsigned char*>(
      output->getTopDevice()->accessBitmap(true).getPixels());
  gl_helper_->AsyncCopyTextureTo(container->texture_id(),
                                 container->size(),
                                 size,
                                 addr,
                                 callback);
}

void RenderWidgetHostViewAura::OnAcceleratedCompositingStateChange() {
  // Delay UpdateExternalTexture until we actually got a software frame.
  // Sometimes (e.g. on a page load) the renderer will spuriously disable then
  // re-enable accelerated compositing, causing us to flash.
  // TODO(piman): factor the enable/disable accelerated compositing message into
  // the UpdateRect/AcceleratedSurfaceBuffersSwapped messages so that we have
  // fewer inconsistent temporary states.
  needs_update_texture_ = true;
}

void RenderWidgetHostViewAura::UpdateExternalTexture() {
  needs_update_texture_ = false;
  if (current_surface_ != 0 &&
      host_->is_accelerated_compositing_active()) {

    ImageTransportClient* container =
        image_transport_clients_[current_surface_];
    if (container)
      container->Update();
    window_->SetExternalTexture(container);

    if (!container) {
      resize_locks_.clear();
    } else {
      typedef std::vector<linked_ptr<ResizeLock> > ResizeLockList;
      ResizeLockList::iterator it = resize_locks_.begin();
      while (it != resize_locks_.end()) {
        if ((*it)->expected_size() == container->size())
          break;
        ++it;
      }
      if (it != resize_locks_.end()) {
        ++it;
        ui::Compositor* compositor = GetCompositor();
        if (compositor) {
          // Delay the release of the lock until we've kicked a frame with the
          // new texture, to avoid resizing the UI before we have a chance to
          // draw a "good" frame.
          locks_pending_draw_.insert(
              locks_pending_draw_.begin(), resize_locks_.begin(), it);
          // However since we got the size we were looking for, unlock the
          // compositor.
          for (ResizeLockList::iterator it2 = resize_locks_.begin();
              it2 !=it; ++it2) {
            it2->get()->UnlockCompositor();
          }
          if (!compositor->HasObserver(this))
            compositor->AddObserver(this);
        }
        resize_locks_.erase(resize_locks_.begin(), it);
      }
    }
  } else {
    window_->SetExternalTexture(NULL);
    resize_locks_.clear();
  }
}

void RenderWidgetHostViewAura::AcceleratedSurfaceBuffersSwapped(
    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params,
    int gpu_host_id) {
  current_surface_ = params.surface_handle;
  UpdateExternalTexture();

  ui::Compositor* compositor = GetCompositor();
  if (!compositor) {
    // We have no compositor, so we have no way to display the surface.
    // Must still send the ACK.
    RenderWidgetHostImpl::AcknowledgeSwapBuffers(params.route_id, gpu_host_id);
  } else {
    gfx::Size surface_size =
        image_transport_clients_[params.surface_handle]->size();
    window_->SchedulePaintInRect(gfx::Rect(surface_size));

    if (!resize_locks_.empty() && !compositor->DrawPending()) {
      // If we are waiting for the resize, fast-track the ACK.
      // However only do so if we're not between the Draw() and the
      // OnCompositingEnded(), because out-of-order execution in the GPU process
      // might corrupt the "front buffer" for the currently issued frame.
      RenderWidgetHostImpl::AcknowledgeSwapBuffers(
          params.route_id, gpu_host_id);
    } else {
      // Add sending an ACK to the list of things to do OnCompositingEnded
      on_compositing_ended_callbacks_.push_back(
          base::Bind(&RenderWidgetHostImpl::AcknowledgeSwapBuffers,
                     params.route_id, gpu_host_id));
      if (!compositor->HasObserver(this))
        compositor->AddObserver(this);
    }
  }
}

void RenderWidgetHostViewAura::AcceleratedSurfacePostSubBuffer(
    const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
    int gpu_host_id) {
  current_surface_ = params.surface_handle;
  UpdateExternalTexture();

  ui::Compositor* compositor = GetCompositor();
  if (!compositor) {
    // We have no compositor, so we have no way to display the surface
    // Must still send the ACK
    RenderWidgetHostImpl::AcknowledgePostSubBuffer(
        params.route_id, gpu_host_id);
  } else {
    gfx::Size surface_size =
        image_transport_clients_[params.surface_handle]->size();

    // Co-ordinates come in OpenGL co-ordinate space.
    // We need to convert to layer space.
    window_->SchedulePaintInRect(gfx::Rect(
        params.x,
        surface_size.height() - params.y - params.height,
        params.width,
        params.height));

    if (!resize_locks_.empty() && !compositor->DrawPending()) {
      // If we are waiting for the resize, fast-track the ACK.
      // However only do so if we're not between the Draw() and the
      // OnCompositingEnded(), because out-of-order execution in the GPU process
      // might corrupt the "front buffer" for the currently issued frame.
      RenderWidgetHostImpl::AcknowledgePostSubBuffer(
          params.route_id, gpu_host_id);
    } else {
      // Add sending an ACK to the list of things to do OnCompositingEnded
      on_compositing_ended_callbacks_.push_back(
          base::Bind(&RenderWidgetHostImpl::AcknowledgePostSubBuffer,
                     params.route_id, gpu_host_id));
      if (!compositor->HasObserver(this))
        compositor->AddObserver(this);
    }
  }
}

void RenderWidgetHostViewAura::AcceleratedSurfaceSuspend() {
}

void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
      int32 width,
      int32 height,
      uint64* surface_handle,
      TransportDIB::Handle* shm_handle) {
  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
  scoped_refptr<ImageTransportClient> surface(factory->CreateTransportClient(
        gfx::Size(width, height), surface_handle));
  if (!surface) {
    LOG(ERROR) << "Failed to create ImageTransportClient";
    return;
  }
  *shm_handle = surface->Handle();

  image_transport_clients_[*surface_handle] = surface;
}

void RenderWidgetHostViewAura::AcceleratedSurfaceRelease(
    uint64 surface_handle) {
  if (current_surface_ == surface_handle) {
    current_surface_ = 0;
    UpdateExternalTexture();
  }
  image_transport_clients_.erase(surface_handle);
}

void RenderWidgetHostViewAura::SetBackground(const SkBitmap& background) {
  content::RenderWidgetHostViewBase::SetBackground(background);
  host_->SetBackground(background);
  window_->layer()->SetFillsBoundsOpaquely(background.isOpaque());
}

void RenderWidgetHostViewAura::GetScreenInfo(WebKit::WebScreenInfo* results) {
  GetScreenInfoForWindow(results, window_);
}

gfx::Rect RenderWidgetHostViewAura::GetRootWindowBounds() {
  return window_->GetToplevelWindow()->bounds();
}

void RenderWidgetHostViewAura::ProcessTouchAck(
    WebKit::WebInputEvent::Type type, bool processed) {
  // The ACKs for the touch-events arrive in the same sequence as they were
  // dispatched.
  aura::RootWindow* root_window = window_->GetRootWindow();
  if (root_window)
    root_window->AdvanceQueuedTouchEvent(window_, processed);
}

void RenderWidgetHostViewAura::SetHasHorizontalScrollbar(
    bool has_horizontal_scrollbar) {
  // Not needed. Mac-only.
}

void RenderWidgetHostViewAura::SetScrollOffsetPinning(
    bool is_pinned_to_left, bool is_pinned_to_right) {
  // Not needed. Mac-only.
}

gfx::GLSurfaceHandle RenderWidgetHostViewAura::GetCompositingSurface() {
  ui::Compositor* compositor = GetCompositor();
  if (shared_surface_handle_.is_null() && compositor) {
    ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
    shared_surface_handle_ = factory->CreateSharedSurfaceHandle(compositor);
    factory->AddObserver(this);
  }
  return shared_surface_handle_;
}

bool RenderWidgetHostViewAura::LockMouse() {
  aura::RootWindow* root_window = window_->GetRootWindow();
  if (!root_window)
    return false;

  if (mouse_locked_)
    return true;

  mouse_locked_ = true;

  root_window->SetCapture(window_, ui::CW_LOCK_MOUSE);
  if (root_window->ConfineCursorToWindow()) {
    root_window->ShowCursor(false);
    synthetic_move_sent_ = true;
    root_window->MoveCursorTo(window_->bounds().CenterPoint());
    if (aura::client::GetTooltipClient(root_window))
      aura::client::GetTooltipClient(root_window)->SetTooltipsEnabled(false);
    return true;
  } else {
    mouse_locked_ = false;
    root_window->ReleaseCapture(window_);
    return false;
  }
}

void RenderWidgetHostViewAura::UnlockMouse() {
  aura::RootWindow* root_window = window_->GetRootWindow();
  if (!mouse_locked_ || !root_window)
    return;

  mouse_locked_ = false;

  root_window->ReleaseCapture(window_);
  root_window->MoveCursorTo(unlocked_global_mouse_position_);
  root_window->ShowCursor(true);
  if (aura::client::GetTooltipClient(root_window))
    aura::client::GetTooltipClient(root_window)->SetTooltipsEnabled(true);

  host_->LostMouseLock();
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, ui::TextInputClient implementation:
void RenderWidgetHostViewAura::SetCompositionText(
    const ui::CompositionText& composition) {
  if (!host_)
    return;

  // ui::CompositionUnderline should be identical to
  // WebKit::WebCompositionUnderline, so that we can do reinterpret_cast safely.
  COMPILE_ASSERT(sizeof(ui::CompositionUnderline) ==
                 sizeof(WebKit::WebCompositionUnderline),
                 ui_CompositionUnderline__WebKit_WebCompositionUnderline_diff);

  // TODO(suzhe): convert both renderer_host and renderer to use
  // ui::CompositionText.
  const std::vector<WebKit::WebCompositionUnderline>& underlines =
      reinterpret_cast<const std::vector<WebKit::WebCompositionUnderline>&>(
          composition.underlines);

  // TODO(suzhe): due to a bug of webkit, we can't use selection range with
  // composition string. See: https://bugs.webkit.org/show_bug.cgi?id=37788
  host_->ImeSetComposition(composition.text, underlines,
                           composition.selection.end(),
                           composition.selection.end());

  has_composition_text_ = !composition.text.empty();
}

void RenderWidgetHostViewAura::ConfirmCompositionText() {
  if (host_ && has_composition_text_)
    host_->ImeConfirmComposition();
  has_composition_text_ = false;
}

void RenderWidgetHostViewAura::ClearCompositionText() {
  if (host_ && has_composition_text_)
    host_->ImeCancelComposition();
  has_composition_text_ = false;
}

void RenderWidgetHostViewAura::InsertText(const string16& text) {
  DCHECK(text_input_type_ != ui::TEXT_INPUT_TYPE_NONE);
  if (host_)
    host_->ImeConfirmComposition(text);
  has_composition_text_ = false;
}

void RenderWidgetHostViewAura::InsertChar(char16 ch, int flags) {
  if (popup_child_host_view_ && popup_child_host_view_->NeedsInputGrab()) {
    popup_child_host_view_->InsertChar(ch, flags);
    return;
  }

  if (host_) {
    // Send a WebKit::WebInputEvent::Char event to |host_|.
    NativeWebKeyboardEvent webkit_event(ui::ET_KEY_PRESSED,
                                        true /* is_char */,
                                        ch,
                                        flags,
                                        base::Time::Now().ToDoubleT());
    host_->ForwardKeyboardEvent(webkit_event);
  }
}

ui::TextInputType RenderWidgetHostViewAura::GetTextInputType() const {
  return text_input_type_;
}

bool RenderWidgetHostViewAura::CanComposeInline() const {
  return can_compose_inline_;
}

gfx::Rect RenderWidgetHostViewAura::GetCaretBounds() {
  const gfx::Rect rect = selection_start_rect_.Union(selection_end_rect_);
  gfx::Point origin = rect.origin();
  gfx::Point end = gfx::Point(rect.right(), rect.bottom());

  aura::RootWindow* root_window = window_->GetRootWindow();
  aura::Window::ConvertPointToWindow(window_, root_window, &origin);
  aura::Window::ConvertPointToWindow(window_, root_window, &end);
  // TODO(yusukes): Unlike Chrome OS, |root_window| origin might not be the
  // same as the system screen origin on Windows and Linux. Probably we should
  // (implement and) use something like ConvertPointToScreen().

  return gfx::Rect(origin.x(),
                   origin.y(),
                   end.x() - origin.x(),
                   end.y() - origin.y());
}

bool RenderWidgetHostViewAura::HasCompositionText() {
  return has_composition_text_;
}

bool RenderWidgetHostViewAura::GetTextRange(ui::Range* range) {
  range->set_start(selection_text_offset_);
  range->set_end(selection_text_offset_ + selection_text_.length());
  return true;
}

bool RenderWidgetHostViewAura::GetCompositionTextRange(ui::Range* range) {
  // TODO(suzhe): implement this method when fixing http://crbug.com/55130.
  NOTIMPLEMENTED();
  return false;
}

bool RenderWidgetHostViewAura::GetSelectionRange(ui::Range* range) {
  range->set_start(selection_range_.start());
  range->set_end(selection_range_.end());
  return true;
}

bool RenderWidgetHostViewAura::SetSelectionRange(const ui::Range& range) {
  // TODO(suzhe): implement this method when fixing http://crbug.com/55130.
  NOTIMPLEMENTED();
  return false;
}

bool RenderWidgetHostViewAura::DeleteRange(const ui::Range& range) {
  // TODO(suzhe): implement this method when fixing http://crbug.com/55130.
  NOTIMPLEMENTED();
  return false;
}

bool RenderWidgetHostViewAura::GetTextFromRange(
    const ui::Range& range,
    string16* text) {
  ui::Range selection_text_range(selection_text_offset_,
      selection_text_offset_ + selection_text_.length());

  if (!selection_text_range.Contains(range)) {
    text->clear();
    return false;
  }
  if (selection_text_range.EqualsIgnoringDirection(range)) {
    // Avoid calling substr whose performance is low.
    *text = selection_text_;
  } else {
    *text = selection_text_.substr(
        range.GetMin() - selection_text_offset_,
        range.length());
  }
  return true;
}

void RenderWidgetHostViewAura::OnInputMethodChanged() {
  if (!host_)
    return;

  host_->SetInputMethodActive(GetInputMethod()->IsActive());

  // TODO(suzhe): implement the newly added “locale” property of HTML DOM
  // TextEvent.
}

bool RenderWidgetHostViewAura::ChangeTextDirectionAndLayoutAlignment(
      base::i18n::TextDirection direction) {
  if (!host_)
    return false;
  host_->UpdateTextDirection(
      direction == base::i18n::RIGHT_TO_LEFT ?
      WebKit::WebTextDirectionRightToLeft :
      WebKit::WebTextDirectionLeftToRight);
  host_->NotifyTextDirection();
  return true;
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, aura::WindowDelegate implementation:

gfx::Size RenderWidgetHostViewAura::GetMinimumSize() const {
  return gfx::Size();
}

void RenderWidgetHostViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
                                               const gfx::Rect& new_bounds) {
  // We don't care about this one, we are always sized via SetSize() or
  // SetBounds().
}

void RenderWidgetHostViewAura::OnFocus() {
  // We need to honor input bypass if the associated tab is does not want input.
  // This gives the current focused window a chance to be the text input
  // client and handle events.
  if (host_->ignore_input_events())
    return;

  host_->GotFocus();
  host_->SetActive(true);

  ui::InputMethod* input_method = GetInputMethod();
  if (input_method) {
    // Ask the system-wide IME to send all TextInputClient messages to |this|
    // object.
    input_method->SetFocusedTextInputClient(this);
    host_->SetInputMethodActive(input_method->IsActive());
  } else {
    host_->SetInputMethodActive(false);
  }
}

void RenderWidgetHostViewAura::OnBlur() {
  host_->SetActive(false);
  host_->Blur();

  ui::InputMethod* input_method = GetInputMethod();
  if (input_method) {
    if (input_method->GetTextInputClient() == this)
      input_method->SetFocusedTextInputClient(NULL);
  }
  host_->SetInputMethodActive(false);
}

bool RenderWidgetHostViewAura::OnKeyEvent(aura::KeyEvent* event) {
  if (popup_child_host_view_ && popup_child_host_view_->NeedsInputGrab() &&
      popup_child_host_view_->OnKeyEvent(event))
    return true;

  // We need to handle the Escape key for Pepper Flash.
  if (is_fullscreen_ && event->key_code() == ui::VKEY_ESCAPE) {
    host_->Shutdown();
  } else {
    // We don't have to communicate with an input method here.
    if (!event->HasNativeEvent()) {
      // Send a fabricated event, which is usually a VKEY_PROCESSKEY IME event.
      NativeWebKeyboardEvent webkit_event(event->type(),
                                          false /* is_char */,
                                          event->GetCharacter(),
                                          event->flags(),
                                          base::Time::Now().ToDoubleT());
      host_->ForwardKeyboardEvent(webkit_event);
    } else {
      NativeWebKeyboardEvent webkit_event(event);
      host_->ForwardKeyboardEvent(webkit_event);
    }
  }
  return true;
}

gfx::NativeCursor RenderWidgetHostViewAura::GetCursor(const gfx::Point& point) {
  if (mouse_locked_)
    return ui::kCursorNone;
  return current_cursor_.GetNativeCursor();
}

int RenderWidgetHostViewAura::GetNonClientComponent(
    const gfx::Point& point) const {
  return HTCLIENT;
}

bool RenderWidgetHostViewAura::OnMouseEvent(aura::MouseEvent* event) {
  if (mouse_locked_) {
    WebKit::WebMouseEvent mouse_event = content::MakeWebMouseEvent(event);
    gfx::Point center = window_->bounds().CenterPoint();

    bool is_move_to_center_event = (event->type() == ui::ET_MOUSE_MOVED ||
        event->type() == ui::ET_MOUSE_DRAGGED) &&
        mouse_event.globalX == center.x() && mouse_event.globalY == center.y();

    ModifyEventMovementAndCoords(&mouse_event);

    bool should_not_forward = is_move_to_center_event && synthetic_move_sent_;
    if (should_not_forward) {
      synthetic_move_sent_ = false;
    } else {
      // Check if the mouse has reached the border and needs to be centered.
      if (ShouldMoveToCenter()) {
        synthetic_move_sent_ = true;
        window_->GetRootWindow()->MoveCursorTo(center);
      }

      // Forward event to renderer.
      if (CanRendererHandleEvent(event))
        host_->ForwardMouseEvent(mouse_event);
    }

    return false;
  }

  if (event->type() == ui::ET_MOUSEWHEEL) {
    WebKit::WebMouseWheelEvent mouse_wheel_event =
        content::MakeWebMouseWheelEvent(event);
    if (mouse_wheel_event.deltaX != 0 || mouse_wheel_event.deltaY != 0)
      host_->ForwardWheelEvent(mouse_wheel_event);
  } else if (event->type() == ui::ET_SCROLL) {
    WebKit::WebMouseWheelEvent mouse_wheel_event =
        content::MakeWebMouseWheelEvent(static_cast<aura::ScrollEvent*>(event));
    host_->ForwardWheelEvent(mouse_wheel_event);
  } else if (event->type() == ui::ET_SCROLL_FLING_START ||
      event->type() == ui::ET_SCROLL_FLING_CANCEL) {
    WebKit::WebGestureEvent gesture_event =
        content::MakeWebGestureEvent(static_cast<aura::ScrollEvent*>(event));
    host_->ForwardGestureEvent(gesture_event);
  } else if (CanRendererHandleEvent(event)) {
    WebKit::WebMouseEvent mouse_event = content::MakeWebMouseEvent(event);
    ModifyEventMovementAndCoords(&mouse_event);
    host_->ForwardMouseEvent(mouse_event);
  }

  switch (event->type()) {
    case ui::ET_MOUSE_PRESSED:
      window_->SetCapture(ui::CW_LOCK_MOUSE);
      // Confirm existing composition text on mouse click events, to make sure
      // the input caret won't be moved with an ongoing composition text.
      FinishImeCompositionSession();
      break;
    case ui::ET_MOUSE_RELEASED:
      window_->ReleaseCapture();
      break;
    default:
      break;
  }

  // Needed to propagate mouse event to native_tab_contents_view_aura.
  // TODO(pkotwicz): Find a better way of doing this.
  if (window_->parent()->delegate())
    window_->parent()->delegate()->OnMouseEvent(event);

  // Return true so that we receive released/drag events.
  return true;
}

ui::TouchStatus RenderWidgetHostViewAura::OnTouchEvent(
    aura::TouchEvent* event) {
  // Update the touch event first.
  WebKit::WebTouchPoint* point = content::UpdateWebTouchEvent(event,
      &touch_event_);

  // Forward the touch event only if a touch point was updated, and there's a
  // touch-event handler in the page.
  if (point && host_->has_touch_handler()) {
    host_->ForwardTouchEvent(touch_event_);
    UpdateWebTouchEventAfterDispatch(&touch_event_, point);
    return DecideTouchStatus(touch_event_, point);
  }

  return ui::TOUCH_STATUS_UNKNOWN;
}

ui::GestureStatus RenderWidgetHostViewAura::OnGestureEvent(
    aura::GestureEvent* event) {
  WebKit::WebGestureEvent gesture = content::MakeWebGestureEvent(event);
  if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
    // Webkit does not stop a fling-scroll on tap-down. So explicitly send an
    // event to stop any in-progress flings.
    WebKit::WebGestureEvent fling_cancel = gesture;
    fling_cancel.type = WebKit::WebInputEvent::GestureFlingCancel;
    host_->ForwardGestureEvent(fling_cancel);
  }
  host_->ForwardGestureEvent(gesture);

  // If a gesture is not processed by the webpage, then WebKit processes it
  // (e.g. generates synthetic mouse events). So CONSUMED should be returned
  // from here to avoid any duplicate synthetic mouse-events being generated
  // from aura.
  return ui::GESTURE_STATUS_CONSUMED;
}

bool RenderWidgetHostViewAura::CanFocus() {
  return popup_type_ == WebKit::WebPopupTypeNone;
}

void RenderWidgetHostViewAura::OnCaptureLost() {
  host_->LostCapture();
}

void RenderWidgetHostViewAura::OnPaint(gfx::Canvas* canvas) {
  if (!window_->IsVisible())
    return;
  paint_canvas_ = canvas;
  BackingStore* backing_store = host_->GetBackingStore(true);
  paint_canvas_ = NULL;
  if (backing_store) {
    static_cast<BackingStoreSkia*>(backing_store)->SkiaShowRect(gfx::Point(),
                                                                canvas);
  } else {
    canvas->FillRect(gfx::Rect(window_->bounds().size()), SK_ColorWHITE);
  }
}

void RenderWidgetHostViewAura::OnWindowDestroying() {
}

void RenderWidgetHostViewAura::OnWindowDestroyed() {
  host_->ViewDestroyed();
  delete this;
}

void RenderWidgetHostViewAura::OnWindowVisibilityChanged(bool visible) {
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, aura::client::ActivationDelegate implementation:

bool RenderWidgetHostViewAura::ShouldActivate(const aura::Event* event) {
  if (event && event->type() == ui::ET_MOUSE_PRESSED)
    host_->OnMouseActivate();
  return is_fullscreen_;
}

void RenderWidgetHostViewAura::OnActivated() {
}

void RenderWidgetHostViewAura::OnLostActive() {
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, ui::CompositorDelegate implementation:

void RenderWidgetHostViewAura::OnCompositingStarted(
    ui::Compositor* compositor) {
  locks_pending_draw_.clear();
}

void RenderWidgetHostViewAura::OnCompositingEnded(ui::Compositor* compositor) {
  RunCompositingCallbacks();
  compositor->RemoveObserver(this);
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, ImageTransportFactoryObserver implementation:

void RenderWidgetHostViewAura::OnLostResources(ui::Compositor* compositor) {
  image_transport_clients_.clear();
  current_surface_ = 0;
  UpdateExternalTexture();
  locks_pending_draw_.clear();

  DCHECK(!shared_surface_handle_.is_null());
  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
  factory->DestroySharedSurfaceHandle(shared_surface_handle_);
  shared_surface_handle_ = factory->CreateSharedSurfaceHandle(compositor);
  host_->CompositingSurfaceUpdated();
  host_->ScheduleComposite();

  if (gl_helper_.get()) {
    // Detach the resources to avoid deleting them using the invalid context.
    // They've been released anyway when the GPU process died.
    gl_helper_->Detach();
    gl_helper_.reset(CreateGLHelper(compositor));
  }
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostViewAura, private:

void RenderWidgetHostViewAura::UpdateCursorIfOverSelf() {
  const gfx::Point screen_point = gfx::Screen::GetCursorScreenPoint();
  aura::RootWindow* root_window = window_->GetRootWindow();
  if (!root_window)
    return;

  if (root_window->GetEventHandlerForPoint(screen_point) != window_)
    return;

  gfx::NativeCursor cursor = current_cursor_.GetNativeCursor();
  if (is_loading_ && cursor == ui::kCursorPointer)
    cursor = ui::kCursorProgress;

  root_window->SetCursor(cursor);
}

ui::InputMethod* RenderWidgetHostViewAura::GetInputMethod() const {
  aura::RootWindow* root_window = window_->GetRootWindow();
  return root_window->GetProperty(aura::client::kRootWindowInputMethodKey);
}

bool RenderWidgetHostViewAura::NeedsInputGrab() {
  return popup_type_ == WebKit::WebPopupTypeSelect;
}

void RenderWidgetHostViewAura::FinishImeCompositionSession() {
  if (!has_composition_text_)
    return;
  if (host_)
    host_->ImeConfirmComposition();
  ImeCancelComposition();
}

void RenderWidgetHostViewAura::ModifyEventMovementAndCoords(
    WebKit::WebMouseEvent* event) {
  // If the mouse has just entered, we must report zero movementX/Y. Hence we
  // reset any global_mouse_position set previously.
  if (event->type == WebKit::WebInputEvent::MouseEnter ||
      event->type == WebKit::WebInputEvent::MouseLeave)
    global_mouse_position_.SetPoint(event->globalX, event->globalY);

  // Movement is computed by taking the difference of the new cursor position
  // and the previous. Under mouse lock the cursor will be warped back to the
  // center so that we are not limited by clipping boundaries.
  // We do not measure movement as the delta from cursor to center because
  // we may receive more mouse movement events before our warp has taken
  // effect.
  event->movementX = event->globalX - global_mouse_position_.x();
  event->movementY = event->globalY - global_mouse_position_.y();

  global_mouse_position_.SetPoint(event->globalX, event->globalY);

  // Under mouse lock, coordinates of mouse are locked to what they were when
  // mouse lock was entered.
  if (mouse_locked_) {
    event->x = unlocked_mouse_position_.x();
    event->y = unlocked_mouse_position_.y();
    event->windowX = unlocked_mouse_position_.x();
    event->windowY = unlocked_mouse_position_.y();
    event->globalX = unlocked_global_mouse_position_.x();
    event->globalY = unlocked_global_mouse_position_.y();
  } else {
    unlocked_mouse_position_.SetPoint(event->windowX, event->windowY);
    unlocked_global_mouse_position_.SetPoint(event->globalX, event->globalY);
  }
}

void RenderWidgetHostViewAura::SchedulePaintIfNotInClip(
    const gfx::Rect& rect,
    const gfx::Rect& clip) {
  if (!clip.IsEmpty()) {
    gfx::Rect to_paint = rect.Subtract(clip);
    if (!to_paint.IsEmpty())
      window_->SchedulePaintInRect(to_paint);
  } else {
    window_->SchedulePaintInRect(rect);
  }
}

bool RenderWidgetHostViewAura::ShouldMoveToCenter() {
  gfx::Rect rect = window_->bounds();
  int border_x = rect.width() * kMouseLockBorderPercentage / 100;
  int border_y = rect.height() * kMouseLockBorderPercentage / 100;

  return global_mouse_position_.x() < rect.x() + border_x ||
      global_mouse_position_.x() > rect.right() - border_x ||
      global_mouse_position_.y() < rect.y() + border_y ||
      global_mouse_position_.y() > rect.bottom() - border_y;
}

void RenderWidgetHostViewAura::RunCompositingCallbacks() {
  for (std::vector< base::Callback<void(void)> >::const_iterator
      it = on_compositing_ended_callbacks_.begin();
      it != on_compositing_ended_callbacks_.end(); ++it) {
    it->Run();
  }
  on_compositing_ended_callbacks_.clear();
}

void RenderWidgetHostViewAura::RemovingFromRootWindow() {
  // We are about to disconnect ourselves from the compositor, we need to issue
  // the callbacks now, because we won't get notified when the frame is done.
  // TODO(piman): this might in theory cause a race where the GPU process starts
  // drawing to the buffer we haven't yet displayed. This will only show for 1
  // frame though, because we will reissue a new frame right away without that
  // composited data.
  RunCompositingCallbacks();
  locks_pending_draw_.clear();
  ui::Compositor* compositor = GetCompositor();
  if (compositor && compositor->HasObserver(this))
    compositor->RemoveObserver(this);
}

ui::Compositor* RenderWidgetHostViewAura::GetCompositor() {
  aura::RootWindow* root_window = window_->GetRootWindow();
  return root_window ? root_window->compositor() : NULL;
}

////////////////////////////////////////////////////////////////////////////////
// RenderWidgetHostView, public:

// static
RenderWidgetHostView* RenderWidgetHostView::CreateViewForWidget(
    RenderWidgetHost* widget) {
  return new RenderWidgetHostViewAura(widget);
}

// static
void content::RenderWidgetHostViewPort::GetDefaultScreenInfo(
    WebKit::WebScreenInfo* results) {
  GetScreenInfoForWindow(results, NULL);
}