content/browser/renderer_host/render_frame_proxy_host.cc

// Copyright 2014 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_frame_proxy_host.h"

#include <unordered_map>
#include <utility>
#include <vector>

#include "base/callback.h"
#include "base/hash/hash.h"
#include "base/lazy_instance.h"
#include "content/browser/bad_message.h"
#include "content/browser/blob_storage/chrome_blob_storage_context.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/renderer_host/agent_scheduling_group_host.h"
#include "content/browser/renderer_host/cross_process_frame_connector.h"
#include "content/browser/renderer_host/frame_tree.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/ipc_utils.h"
#include "content/browser/renderer_host/navigator.h"
#include "content/browser/renderer_host/render_frame_host_delegate.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/renderer_host/render_widget_host_view_child_frame.h"
#include "content/browser/scoped_active_url.h"
#include "content/browser/site_instance_impl.h"
#include "content/common/frame_messages.h"
#include "content/common/unfreezable_frame_messages.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "content/public/common/referrer_type_converters.h"
#include "ipc/ipc_message.h"
#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "services/metrics/public/cpp/ukm_recorder.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "services/network/public/cpp/web_sandbox_flags.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
#include "third_party/blink/public/mojom/frame/frame_owner_properties.mojom.h"
#include "third_party/blink/public/mojom/messaging/transferable_message.mojom.h"
#include "third_party/blink/public/mojom/scroll/scroll_into_view_params.mojom.h"

namespace content {

namespace {

RenderFrameProxyHost::CreatedCallback& GetProxyHostCreatedCallback() {
  static base::NoDestructor<RenderFrameProxyHost::CreatedCallback> s_callback;
  return *s_callback;
}

RenderFrameProxyHost::CreatedCallback& GetProxyHostDeletedCallback() {
  static base::NoDestructor<RenderFrameProxyHost::DeletedCallback> s_callback;
  return *s_callback;
}

// The (process id, routing id) pair that identifies one RenderFrameProxy.
typedef std::pair<int32_t, int32_t> RenderFrameProxyHostID;
typedef std::unordered_map<RenderFrameProxyHostID,
                           RenderFrameProxyHost*,
                           base::IntPairHash<RenderFrameProxyHostID>>
    RoutingIDFrameProxyMap;
base::LazyInstance<RoutingIDFrameProxyMap>::DestructorAtExit
    g_routing_id_frame_proxy_map = LAZY_INSTANCE_INITIALIZER;

using TokenFrameMap = std::unordered_map<base::UnguessableToken,
                                         RenderFrameProxyHost*,
                                         base::UnguessableTokenHash>;
base::LazyInstance<TokenFrameMap>::Leaky g_token_frame_proxy_map =
    LAZY_INSTANCE_INITIALIZER;

}  // namespace

// static
void RenderFrameProxyHost::SetCreatedCallbackForTesting(
    const CreatedCallback& created_callback) {
  GetProxyHostCreatedCallback() = created_callback;
}

// static
void RenderFrameProxyHost::SetDeletedCallbackForTesting(
    const DeletedCallback& deleted_callback) {
  GetProxyHostDeletedCallback() = deleted_callback;
}

// static
RenderFrameProxyHost* RenderFrameProxyHost::FromID(int process_id,
                                                   int routing_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  RoutingIDFrameProxyMap* frames = g_routing_id_frame_proxy_map.Pointer();
  auto it = frames->find(RenderFrameProxyHostID(process_id, routing_id));
  return it == frames->end() ? nullptr : it->second;
}

// static
RenderFrameProxyHost* RenderFrameProxyHost::FromFrameToken(
    int process_id,
    const base::UnguessableToken& frame_token) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  TokenFrameMap* frames = g_token_frame_proxy_map.Pointer();
  auto it = frames->find(frame_token);
  // The check against |process_id| isn't strictly necessary, but represents
  // an extra level of protection against a renderer trying to force a frame
  // token.
  return it != frames->end() && it->second->GetProcess()->GetID() == process_id
             ? it->second
             : nullptr;
}

RenderFrameProxyHost::RenderFrameProxyHost(
    SiteInstance* site_instance,
    scoped_refptr<RenderViewHostImpl> render_view_host,
    FrameTreeNode* frame_tree_node)
    : routing_id_(site_instance->GetProcess()->GetNextRoutingID()),
      site_instance_(site_instance),
      process_(site_instance->GetProcess()),
      frame_tree_node_(frame_tree_node),
      render_frame_proxy_created_(false),
      render_view_host_(std::move(render_view_host)) {
  GetAgentSchedulingGroup().AddRoute(routing_id_, this);
  CHECK(
      g_routing_id_frame_proxy_map.Get()
          .insert(std::make_pair(
              RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_), this))
          .second);
  CHECK(g_token_frame_proxy_map.Get()
            .insert(std::make_pair(frame_token_, this))
            .second);
  CHECK(render_view_host_ ||
        frame_tree_node_->render_manager()->IsMainFrameForInnerDelegate());

  bool is_proxy_to_parent =
      !frame_tree_node_->IsMainFrame() &&
      frame_tree_node_->parent()->GetSiteInstance() == site_instance;
  bool is_proxy_to_outer_delegate =
      frame_tree_node_->render_manager()->IsMainFrameForInnerDelegate();

  // If this is a proxy to parent frame or this proxy is for the inner
  // WebContents's FrameTreeNode in outer WebContents's SiteInstance, then we
  // need a CrossProcessFrameConnector.
  if (is_proxy_to_parent || is_proxy_to_outer_delegate) {
    // The RenderFrameHost navigating cross-process is destroyed and a proxy for
    // it is created in the parent's process. CrossProcessFrameConnector
    // initialization only needs to happen on an initial cross-process
    // navigation, when the RenderFrameHost leaves the same process as its
    // parent. The same CrossProcessFrameConnector is used for subsequent cross-
    // process navigations, but it will be destroyed if the frame is
    // navigated back to the same SiteInstance as its parent.
    cross_process_frame_connector_.reset(new CrossProcessFrameConnector(this));
  }

  if (!GetProxyHostCreatedCallback().is_null())
    GetProxyHostCreatedCallback().Run(this);
}

RenderFrameProxyHost::~RenderFrameProxyHost() {
  if (!GetProxyHostDeletedCallback().is_null())
    GetProxyHostDeletedCallback().Run(this);

  if (GetProcess()->IsInitializedAndNotDead()) {
    // TODO(nasko): For now, don't send this IPC for top-level frames, as
    // the top-level RenderFrame will delete the RenderFrameProxy.
    // This can be removed once we don't have a swapped out state on
    // RenderFrame. See https://crbug.com/357747
    if (!frame_tree_node_->IsMainFrame())
      GetAssociatedRemoteFrame()->DetachAndDispose();
  }

  // TODO(arthursonzogni): There are no known reason for removing the
  // RenderViewHostImpl here instead of automatically at the end of the
  // destructor. This line can be removed.
  render_view_host_.reset();

  GetAgentSchedulingGroup().RemoveRoute(routing_id_);
  g_routing_id_frame_proxy_map.Get().erase(
      RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_));
  g_token_frame_proxy_map.Get().erase(frame_token_);
}

void RenderFrameProxyHost::SetChildRWHView(
    RenderWidgetHostView* view,
    const gfx::Size* initial_frame_size) {
  cross_process_frame_connector_->SetView(
      static_cast<RenderWidgetHostViewChildFrame*>(view));
  if (initial_frame_size)
    cross_process_frame_connector_->SetLocalFrameSize(*initial_frame_size);
}

RenderViewHostImpl* RenderFrameProxyHost::GetRenderViewHost() {
  return render_view_host_.get();
}

RenderWidgetHostView* RenderFrameProxyHost::GetRenderWidgetHostView() {
  return frame_tree_node_->parent()
      ->frame_tree_node()
      ->render_manager()
      ->GetRenderWidgetHostView();
}

bool RenderFrameProxyHost::Send(IPC::Message* msg) {
  return GetAgentSchedulingGroup().Send(msg);
}

bool RenderFrameProxyHost::OnMessageReceived(const IPC::Message& msg) {
  return false;
}

bool RenderFrameProxyHost::InitRenderFrameProxy() {
  DCHECK(!render_frame_proxy_created_);
  // We shouldn't be creating proxies for subframes of frames in
  // BackForwardCache.
  DCHECK(!frame_tree_node_->current_frame_host()->IsInBackForwardCache());

  // If the current RenderFrameHost is pending deletion, no new proxies should
  // be created for it, since this frame should no longer be visible from other
  // processes. We can get here with postMessage while trying to recreate
  // proxies for the sender.
  if (frame_tree_node_->current_frame_host()->IsPendingDeletion())
    return false;

  // It is possible to reach this when the process is dead (in particular, when
  // creating proxies from CreateProxiesForChildFrame).  In that case, don't
  // create the proxy.  The process shouldn't be resurrected just to create
  // RenderFrameProxies; it should be restored only if it needs to host a
  // RenderFrame.  When that happens, the process will be reinitialized, and
  // all necessary proxies, including any of the ones we skipped here, will be
  // created by CreateProxiesForSiteInstance. See https://crbug.com/476846
  if (!GetProcess()->IsInitializedAndNotDead())
    return false;

  int parent_routing_id = MSG_ROUTING_NONE;
  if (frame_tree_node_->parent()) {
    // It is safe to use GetRenderFrameProxyHost to get the parent proxy, since
    // new child frames always start out as local frames, so a new proxy should
    // never have a RenderFrameHost as a parent.
    RenderFrameProxyHost* parent_proxy =
        frame_tree_node_->parent()
            ->frame_tree_node()
            ->render_manager()
            ->GetRenderFrameProxyHost(site_instance_.get());
    CHECK(parent_proxy);

    // Proxies that aren't live in the parent node should not be initialized
    // here, since there is no valid parent RenderFrameProxy on the renderer
    // side.  This can happen when adding a new child frame after an opener
    // process crashed and was reloaded.  See https://crbug.com/501152.
    if (!parent_proxy->is_render_frame_proxy_live())
      return false;

    parent_routing_id = parent_proxy->GetRoutingID();
    CHECK_NE(parent_routing_id, MSG_ROUTING_NONE);
  }

  base::Optional<base::UnguessableToken> opener_frame_token;
  if (frame_tree_node_->opener()) {
    opener_frame_token =
        frame_tree_node_->render_manager()->GetOpenerFrameToken(
            site_instance_.get());
  }

  int view_routing_id = GetRenderViewHost()->GetRoutingID();
  static_cast<SiteInstanceImpl*>(site_instance_.get())
      ->GetAgentSchedulingGroup()
      .CreateFrameProxy(routing_id_, view_routing_id, opener_frame_token,
                        parent_routing_id,
                        frame_tree_node_->current_replication_state(),
                        frame_token_, frame_tree_node_->devtools_frame_token());

  SetRenderFrameProxyCreated(true);

  // If this proxy was created for a frame that hasn't yet finished loading,
  // let the renderer know so it can also mark the proxy as loading. See
  // https://crbug.com/916137.
  if (frame_tree_node_->IsLoading())
    GetAssociatedRemoteFrame()->DidStartLoading();

  // For subframes, initialize the proxy's FrameOwnerProperties only if they
  // differ from default values.
  bool should_send_properties =
      !frame_tree_node_->frame_owner_properties().Equals(
          blink::mojom::FrameOwnerProperties());
  if (frame_tree_node_->parent() && should_send_properties) {
    auto frame_owner_properties =
        frame_tree_node_->frame_owner_properties().Clone();
    GetAssociatedRemoteFrame()->SetFrameOwnerProperties(
        std::move(frame_owner_properties));
  }

  return true;
}

AgentSchedulingGroupHost& RenderFrameProxyHost::GetAgentSchedulingGroup() {
  return static_cast<SiteInstanceImpl*>(site_instance_.get())
      ->GetAgentSchedulingGroup();
}

void RenderFrameProxyHost::OnAssociatedInterfaceRequest(
    const std::string& interface_name,
    mojo::ScopedInterfaceEndpointHandle handle) {
  if (interface_name == mojom::RenderFrameProxyHost::Name_) {
    frame_proxy_host_associated_receiver_.Bind(
        mojo::PendingAssociatedReceiver<mojom::RenderFrameProxyHost>(
            std::move(handle)));
  } else if (interface_name == blink::mojom::RemoteFrameHost::Name_) {
    remote_frame_host_receiver_.Bind(
        mojo::PendingAssociatedReceiver<blink::mojom::RemoteFrameHost>(
            std::move(handle)));
  } else if (interface_name == blink::mojom::RemoteMainFrameHost::Name_) {
    remote_main_frame_host_receiver_.Bind(
        mojo::PendingAssociatedReceiver<blink::mojom::RemoteMainFrameHost>(
            std::move(handle)));
  }
}

blink::AssociatedInterfaceProvider*
RenderFrameProxyHost::GetRemoteAssociatedInterfaces() {
  if (!remote_associated_interfaces_) {
    mojo::AssociatedRemote<blink::mojom::AssociatedInterfaceProvider>
        remote_interfaces;
    IPC::ChannelProxy* channel = GetAgentSchedulingGroup().GetChannel();
    if (channel) {
      GetAgentSchedulingGroup().GetRemoteRouteProvider()->GetRoute(
          GetRoutingID(), remote_interfaces.BindNewEndpointAndPassReceiver());
    } else {
      // The channel may not be initialized in some tests environments. In this
      // case we set up a dummy interface provider.
      ignore_result(
          remote_interfaces.BindNewEndpointAndPassDedicatedReceiver());
    }
    remote_associated_interfaces_ =
        std::make_unique<blink::AssociatedInterfaceProvider>(
            remote_interfaces.Unbind());
  }
  return remote_associated_interfaces_.get();
}

void RenderFrameProxyHost::SetRenderFrameProxyCreated(bool created) {
  if (!created) {
    // If the renderer process has gone away, created can be false. In that
    // case, invalidate the mojo connection.
    frame_proxy_host_associated_receiver_.reset();
  }
  render_frame_proxy_created_ = created;
}

const mojo::AssociatedRemote<blink::mojom::RemoteFrame>&
RenderFrameProxyHost::GetAssociatedRemoteFrame() {
  if (!remote_frame_)
    GetRemoteAssociatedInterfaces()->GetInterface(&remote_frame_);
  return remote_frame_;
}

const mojo::AssociatedRemote<blink::mojom::RemoteMainFrame>&
RenderFrameProxyHost::GetAssociatedRemoteMainFrame() {
  if (!remote_main_frame_)
    GetRemoteAssociatedInterfaces()->GetInterface(&remote_main_frame_);
  return remote_main_frame_;
}

const mojo::AssociatedRemote<content::mojom::RenderFrameProxy>&
RenderFrameProxyHost::GetAssociatedRenderFrameProxy() {
  if (!render_frame_proxy_)
    GetRemoteAssociatedInterfaces()->GetInterface(&render_frame_proxy_);
  return render_frame_proxy_;
}

void RenderFrameProxyHost::SetInheritedEffectiveTouchAction(
    cc::TouchAction touch_action) {
  cross_process_frame_connector_->OnSetInheritedEffectiveTouchAction(
      touch_action);
}

void RenderFrameProxyHost::UpdateRenderThrottlingStatus(bool is_throttled,
                                                        bool subtree_throttled,
                                                        bool display_locked) {
  cross_process_frame_connector_->UpdateRenderThrottlingStatus(
      is_throttled, subtree_throttled, display_locked);
}

void RenderFrameProxyHost::VisibilityChanged(
    blink::mojom::FrameVisibility visibility) {
  cross_process_frame_connector_->OnVisibilityChanged(visibility);
}

void RenderFrameProxyHost::UpdateOpener() {
  // Another frame in this proxy's SiteInstance may reach the new opener by
  // first reaching this proxy and then referencing its window.opener.  Ensure
  // the new opener's proxy exists in this case.
  if (frame_tree_node_->opener()) {
    frame_tree_node_->opener()->render_manager()->CreateOpenerProxies(
        GetSiteInstance(), frame_tree_node_);
  }

  auto opener_frame_token =
      frame_tree_node_->render_manager()->GetOpenerFrameToken(
          GetSiteInstance());
  GetAssociatedRemoteFrame()->UpdateOpener(opener_frame_token);
}

void RenderFrameProxyHost::SetFocusedFrame() {
  GetAssociatedRemoteFrame()->Focus();
}

void RenderFrameProxyHost::ScrollRectToVisible(
    const gfx::Rect& rect_to_scroll,
    blink::mojom::ScrollIntoViewParamsPtr params) {
  GetAssociatedRemoteFrame()->ScrollRectToVisible(rect_to_scroll,
                                                  std::move(params));
}

void RenderFrameProxyHost::Detach() {
  if (frame_tree_node_->render_manager()->IsMainFrameForInnerDelegate()) {
    frame_tree_node_->render_manager()->RemoveOuterDelegateFrame();
    return;
  }

  // For a main frame with no outer delegate, no further work is needed. In this
  // case, detach can only be triggered by closing the entire RenderViewHost.
  // Instead, this cleanup relies on the destructors of RenderFrameHost and
  // RenderFrameProxyHost decrementing the refcounts of their associated
  // RenderViewHost. When the refcount hits 0, the corresponding renderer object
  // is cleaned up. Since WebContents destruction will also destroy
  // RenderFrameHost/RenderFrameProxyHost objects in FrameTree, this eventually
  // results in all the associated RenderViewHosts being closed.
  if (frame_tree_node_->IsMainFrame())
    return;

  // Otherwise, a remote child frame has been removed from the frame tree.
  // Make sure that this action is mirrored to all the other renderers, so
  // the frame tree remains consistent.
  frame_tree_node_->current_frame_host()->DetachFromProxy();
}

void RenderFrameProxyHost::CheckCompleted() {
  RenderFrameHostImpl* target_rfh = frame_tree_node()->current_frame_host();
  target_rfh->GetAssociatedLocalFrame()->CheckCompleted();
}

void RenderFrameProxyHost::EnableAutoResize(const gfx::Size& min_size,
                                            const gfx::Size& max_size) {
  GetAssociatedRenderFrameProxy()->EnableAutoResize(min_size, max_size);
}

void RenderFrameProxyHost::DisableAutoResize() {
  GetAssociatedRenderFrameProxy()->DisableAutoResize();
}

void RenderFrameProxyHost::DidUpdateVisualProperties(
    const cc::RenderFrameMetadata& metadata) {
  GetAssociatedRenderFrameProxy()->DidUpdateVisualProperties(metadata);
}

void RenderFrameProxyHost::ChildProcessGone() {
  GetAssociatedRenderFrameProxy()->ChildProcessGone();
}

void RenderFrameProxyHost::DidFocusFrame() {
  RenderFrameHostImpl* render_frame_host =
      frame_tree_node_->current_frame_host();

  // We need to handle this case due to a race, see documentation in
  // RenderFrameHostImpl::DidFocusFrame for more details.
  if (render_frame_host->InsidePortal())
    return;

  render_frame_host->delegate()->SetFocusedFrame(frame_tree_node_,
                                                 GetSiteInstance());
}

void RenderFrameProxyHost::CapturePaintPreviewOfCrossProcessSubframe(
    const gfx::Rect& clip_rect,
    const base::UnguessableToken& guid) {
  RenderFrameHostImpl* rfh = frame_tree_node_->current_frame_host();
  // Do not capture paint on behalf of inactive RenderFrameHost.
  if (rfh->IsInactiveAndDisallowReactivation())
    return;
  rfh->delegate()->CapturePaintPreviewOfCrossProcessSubframe(clip_rect, guid,
                                                             rfh);
}

void RenderFrameProxyHost::SetIsInert(bool inert) {
  cross_process_frame_connector_->SetIsInert(inert);
}

void RenderFrameProxyHost::RouteMessageEvent(
    const base::Optional<base::UnguessableToken>& source_frame_token,
    const base::string16& source_origin,
    const base::string16& target_origin,
    blink::TransferableMessage message) {
  RenderFrameHostImpl* target_rfh = frame_tree_node()->current_frame_host();
  if (!target_rfh->IsRenderFrameLive()) {
    // Check if there is an inner delegate involved; if so target its main
    // frame or otherwise return since there is no point in forwarding the
    // message.
    target_rfh = target_rfh->delegate()->GetMainFrameForInnerDelegate(
        target_rfh->frame_tree_node());
    if (!target_rfh || !target_rfh->IsRenderFrameLive())
      return;
  }

  // |target_origin| argument of postMessage is already checked by
  // blink::LocalDOMWindow::DispatchMessageEventWithOriginCheck (needed for
  // messages sent within the same process - e.g. same-site, cross-origin),
  // but this check needs to be duplicated below in case the recipient renderer
  // process got compromised (i.e. in case the renderer-side check may be
  // bypassed).
  if (!target_origin.empty()) {
    url::Origin target_url_origin =
        url::Origin::Create(GURL(base::UTF16ToUTF8(target_origin)));

    // Renderer should send either an empty string (this is how "*" is expressed
    // in the IPC) or a valid, non-opaque origin.  OTOH, there are no security
    // implications here - the message payload needs to be protected from an
    // unintended recipient, not from the sender.
    DCHECK(!target_url_origin.opaque());

    // While the postMessage was in flight, the target might have navigated away
    // to another origin.  In this case, the postMessage should be silently
    // dropped.
    if (target_url_origin != target_rfh->GetLastCommittedOrigin())
      return;
  }

  // TODO(lukasza): Move opaque-ness check into ChildProcessSecurityPolicyImpl.
  auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
  if (source_origin != base::UTF8ToUTF16("null") &&
      !policy->CanAccessDataForOrigin(GetProcess()->GetID(),
                                      GURL(source_origin))) {
    bad_message::ReceivedBadMessage(
        GetProcess(), bad_message::RFPH_POST_MESSAGE_INVALID_SOURCE_ORIGIN);
    return;
  }

  // Only deliver the message if the request came from a RenderFrameHost in the
  // same BrowsingInstance or if this WebContents is dedicated to a browser
  // plugin guest.
  //
  // TODO(alexmos, lazyboy):  The check for browser plugin guest currently
  // requires going through the delegate.  It should be refactored and
  // performed here once OOPIF support in <webview> is further along.
  SiteInstance* target_site_instance = target_rfh->GetSiteInstance();
  if (!target_site_instance->IsRelatedSiteInstance(GetSiteInstance()) &&
      !target_rfh->delegate()->ShouldRouteMessageEvent(target_rfh,
                                                       GetSiteInstance()))
    return;

  // If there is a |source_frame_token|, translate it to the frame token of the
  // equivalent RenderFrameProxyHost in the target process.
  base::Optional<base::UnguessableToken> translated_source_token;
  ukm::SourceId source_page_ukm_source_id = ukm::kInvalidSourceId;
  if (source_frame_token) {
    RenderFrameHostImpl* source_rfh = RenderFrameHostImpl::FromFrameToken(
        GetProcess()->GetID(), source_frame_token.value());
    if (source_rfh) {
      // https://crbug.com/822958: If the postMessage is going to a descendant
      // frame, ensure that any pending visual properties such as size are sent
      // to the target frame before the postMessage, as sites might implicitly
      // be relying on this ordering.
      bool target_is_descendant_of_source = false;
      for (RenderFrameHost* rfh = target_rfh; rfh; rfh = rfh->GetParent()) {
        if (rfh == source_rfh) {
          target_is_descendant_of_source = true;
          break;
        }
      }
      if (target_is_descendant_of_source) {
        target_rfh->GetRenderWidgetHost()
            ->SynchronizeVisualPropertiesIgnoringPendingAck();
      }

      // Ensure that we have a swapped-out RVH and proxy for the source frame
      // in the target SiteInstance. If it doesn't exist, create it on demand
      // and also create its opener chain, since that will also be accessible
      // to the target page.
      target_rfh->delegate()->EnsureOpenerProxiesExist(source_rfh);

      // If the message source is a cross-process subframe, its proxy will only
      // be created in --site-per-process mode, which is the case when we set an
      // actual non-empty value for |translated_source_token|. Otherwise (if the
      // proxy wasn't created), use an empty |translated_source_token| (see
      // https://crbug.com/485520 for discussion on why this is ok).
      RenderFrameProxyHost* source_proxy_in_target_site_instance =
          source_rfh->frame_tree_node()
              ->render_manager()
              ->GetRenderFrameProxyHost(target_site_instance);
      if (source_proxy_in_target_site_instance) {
        translated_source_token =
            source_proxy_in_target_site_instance->GetFrameToken();
      }

      source_page_ukm_source_id = source_rfh->GetPageUkmSourceId();
    }
  }

  // Record UKM metrics for the postMessage event.
  ukm::builders::PostMessage_Incoming_Page ukm_builder(
      target_rfh->GetPageUkmSourceId());
  if (source_page_ukm_source_id != ukm::kInvalidSourceId)
    ukm_builder.SetSourcePageSourceId(source_page_ukm_source_id);
  ukm_builder.Record(ukm::UkmRecorder::Get());

  target_rfh->PostMessageEvent(translated_source_token, source_origin,
                               target_origin, std::move(message));
}

void RenderFrameProxyHost::PrintCrossProcessSubframe(const gfx::Rect& rect,
                                                     int32_t document_cookie) {
  RenderFrameHostImpl* rfh = frame_tree_node_->current_frame_host();
  rfh->delegate()->PrintCrossProcessSubframe(rect, document_cookie, rfh);
}

void RenderFrameProxyHost::SynchronizeVisualProperties(
    const blink::FrameVisualProperties& frame_visual_properties) {
  cross_process_frame_connector_->OnSynchronizeVisualProperties(
      frame_visual_properties);
}

void RenderFrameProxyHost::FocusPage() {
  frame_tree_node_->current_frame_host()->FocusPage();
}

void RenderFrameProxyHost::TakeFocus(bool reverse) {
  frame_tree_node_->current_frame_host()->TakeFocus(reverse);
}

void RenderFrameProxyHost::UpdateTargetURL(
    const GURL& url,
    blink::mojom::RemoteMainFrameHost::UpdateTargetURLCallback callback) {
  frame_tree_node_->current_frame_host()->UpdateTargetURL(url,
                                                          std::move(callback));
}

void RenderFrameProxyHost::RouteCloseEvent() {
  // Tell the active RenderViewHost to run unload handlers and close, as long
  // as the request came from a RenderViewHost in the same BrowsingInstance.
  // In most cases, we receive this from a swapped out RenderViewHost.
  // It is possible to receive it from one that has just been swapped in,
  // in which case we might as well deliver the message anyway.
  RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
      frame_tree_node_->current_frame_host()->GetRenderViewHost());
  if (GetSiteInstance()->IsRelatedSiteInstance(rvh->GetSiteInstance()))
    rvh->ClosePage();
}

void RenderFrameProxyHost::OpenURL(mojom::OpenURLParamsPtr params) {
  // Verify and unpack IPC payload.
  GURL validated_url;
  scoped_refptr<network::SharedURLLoaderFactory> blob_url_loader_factory;
  if (!VerifyOpenURLParams(GetSiteInstance(), params, &validated_url,
                           &blob_url_loader_factory)) {
    return;
  }

  RenderFrameHostImpl* current_rfh = frame_tree_node_->current_frame_host();

  // Only active frames can navigate:
  // - If the frame is in pending deletion, ignore the navigation, because the
  // frame is going to disappear soon anyway.
  // - If the frame is in back-forward cache, it's not allowed to navigate as it
  // should remain frozen. Ignore the request and evict the document from
  // back-forward cache.
  if (current_rfh->IsInactiveAndDisallowReactivation())
    return;

  // Verify that we are in the same BrowsingInstance as the current
  // RenderFrameHost.
  if (!site_instance_->IsRelatedSiteInstance(current_rfh->GetSiteInstance()))
    return;

  // Since this navigation targeted a specific RenderFrameProxy, it should stay
  // in the current tab.
  DCHECK_EQ(WindowOpenDisposition::CURRENT_TAB, params->disposition);

  // Augment |download_policy| for situations that were not covered on the
  // renderer side, e.g. status not available on remote frame, etc.
  NavigationDownloadPolicy download_policy = params->download_policy;
  GetContentClient()->browser()->AugmentNavigationDownloadPolicy(
      frame_tree_node_->navigator().GetController()->GetWebContents(),
      current_rfh, params->user_gesture, &download_policy);

  if ((frame_tree_node_->pending_frame_policy().sandbox_flags &
       network::mojom::WebSandboxFlags::kDownloads) !=
      network::mojom::WebSandboxFlags::kNone) {
    if (download_policy.blocking_downloads_in_sandbox_enabled) {
      download_policy.SetDisallowed(content::NavigationDownloadType::kSandbox);
    } else {
      download_policy.SetAllowed(content::NavigationDownloadType::kSandbox);
    }
  }

  // TODO(lfg, lukasza): Remove |extra_headers| parameter from
  // RequestTransferURL method once both RenderFrameProxyHost and
  // RenderFrameHostImpl call RequestOpenURL from their OnOpenURL handlers.
  // See also https://crbug.com/647772.
  // TODO(clamy): The transition should probably be changed for POST navigations
  // to PAGE_TRANSITION_FORM_SUBMIT. See https://crbug.com/829827.
  frame_tree_node_->navigator().NavigateFromFrameProxy(
      current_rfh, validated_url,
      params->initiator_frame_token.has_value()
          ? &params->initiator_frame_token.value()
          : nullptr,
      GetProcess()->GetID(), params->initiator_origin, site_instance_.get(),
      params->referrer.To<content::Referrer>(), ui::PAGE_TRANSITION_LINK,
      params->should_replace_current_entry, download_policy,
      params->post_body ? "POST" : "GET", params->post_body,
      params->extra_headers, std::move(blob_url_loader_factory),
      params->user_gesture, params->impression);
}

void RenderFrameProxyHost::UpdateViewportIntersection(
    blink::mojom::ViewportIntersectionStatePtr intersection_state) {
  cross_process_frame_connector_->UpdateViewportIntersection(
      *intersection_state);
}

void RenderFrameProxyHost::DidChangeOpener(
    const base::Optional<base::UnguessableToken>& opener_frame_token) {
  frame_tree_node_->render_manager()->DidChangeOpener(
      opener_frame_token.value_or(base::UnguessableToken()), GetSiteInstance());
}

void RenderFrameProxyHost::AdvanceFocus(
    blink::mojom::FocusType focus_type,
    const base::UnguessableToken& source_frame_token) {
  RenderFrameHostImpl* target_rfh = frame_tree_node_->current_frame_host();
  if (target_rfh->InsidePortal()) {
    bad_message::ReceivedBadMessage(
        GetProcess(), bad_message::RFPH_ADVANCE_FOCUS_INTO_PORTAL);
    return;
  }

  // Translate the source RenderFrameHost in this process to its equivalent
  // RenderFrameProxyHost in the target process.  This is needed for continuing
  // the focus traversal from correct place in a parent frame after one of its
  // child frames finishes its traversal.
  RenderFrameHostImpl* source_rfh = RenderFrameHostImpl::FromFrameToken(
      GetProcess()->GetID(), source_frame_token);
  RenderFrameProxyHost* source_proxy =
      source_rfh ? source_rfh->frame_tree_node()
                       ->render_manager()
                       ->GetRenderFrameProxyHost(target_rfh->GetSiteInstance())
                 : nullptr;

  target_rfh->AdvanceFocus(focus_type, source_proxy);
  frame_tree_node_->current_frame_host()->delegate()->OnAdvanceFocus(
      source_rfh);
}

bool RenderFrameProxyHost::IsInertForTesting() {
  return cross_process_frame_connector_->IsInert();
}

blink::AssociatedInterfaceProvider*
RenderFrameProxyHost::GetRemoteAssociatedInterfacesTesting() {
  return GetRemoteAssociatedInterfaces();
}

}  // namespace content