chrome_frame/chrome_frame_activex.cc - chromium/src - Git at Google

 // Copyright (c) 2011 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 "chrome_frame/chrome_frame_activex.h"

 #include <wininet.h>

 #include <algorithm>
 #include <map>

 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_variant.h"
 #include "chrome/common/automation_messages.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome_frame/utils.h"
 #include "googleurl/src/gurl.h"

 namespace {

 // Class used to maintain a mapping from top-level windows to ChromeFrameActivex
 // instances.
 class TopLevelWindowMapping {
  public:
   typedef std::vector<HWND> WindowList;

   static TopLevelWindowMapping* GetInstance() {
     return Singleton<TopLevelWindowMapping>::get();
   }

   // Add |cf_window| to the set of windows registered under |top_window|.
   void AddMapping(HWND top_window, HWND cf_window) {
     top_window_map_lock_.Lock();
     top_window_map_[top_window].push_back(cf_window);
     top_window_map_lock_.Unlock();
   }

   // Return the set of Chrome-Frame instances under |window|.
   WindowList GetInstances(HWND window) {
     top_window_map_lock_.Lock();
     WindowList list = top_window_map_[window];
     top_window_map_lock_.Unlock();
     return list;
   }

  private:
   // Constructor is private as this class it to be used as a singleton.
   // See static method instance().
   TopLevelWindowMapping() {}

   friend struct DefaultSingletonTraits<TopLevelWindowMapping>;

   typedef std::map<HWND, WindowList> TopWindowMap;
   TopWindowMap top_window_map_;

   CComAutoCriticalSection top_window_map_lock_;

   DISALLOW_COPY_AND_ASSIGN(TopLevelWindowMapping);
 };

 // Message pump hook function that monitors for WM_MOVE and WM_MOVING
 // messages on a top-level window, and passes notification to the appropriate
 // Chrome-Frame instances.
 LRESULT CALLBACK TopWindowProc(int code, WPARAM wparam, LPARAM lparam) {
   CWPSTRUCT *info = reinterpret_cast<CWPSTRUCT*>(lparam);
   const UINT &message = info->message;
   const HWND &message_hwnd = info->hwnd;

   switch (message) {
     case WM_MOVE:
     case WM_MOVING: {
       TopLevelWindowMapping::WindowList cf_instances =
           TopLevelWindowMapping::GetInstance()->GetInstances(message_hwnd);
       TopLevelWindowMapping::WindowList::iterator
           iter(cf_instances.begin()), end(cf_instances.end());
       for (;iter != end; ++iter) {
         PostMessage(*iter, WM_HOST_MOVED_NOTIFICATION, NULL, NULL);
       }
       break;
     }
     default:
       break;
   }

   return CallNextHookEx(0, code, wparam, lparam);
 }

 HHOOK InstallLocalWindowHook(HWND window) {
   if (!window)
     return NULL;

   DWORD proc_thread = ::GetWindowThreadProcessId(window, NULL);
   if (!proc_thread)
     return NULL;

   // Note that this hook is installed as a LOCAL hook.
   return  ::SetWindowsHookEx(WH_CALLWNDPROC,
                              TopWindowProc,
                              NULL,
                              proc_thread);
 }

 }  // unnamed namespace

 namespace chrome_frame {
 std::string ActiveXCreateUrl(const GURL& parsed_url,
                              const AttachExternalTabParams& params) {
   return base::StringPrintf(
       "%hs?attach_external_tab&%I64u&%d&%d&%d&%d&%d&%hs",
       parsed_url.GetOrigin().spec().c_str(),
       params.cookie,
       params.disposition,
       params.dimensions.x(),
       params.dimensions.y(),
       params.dimensions.width(),
       params.dimensions.height(),
       params.profile_name.c_str());
 }

 int GetDisposition(const AttachExternalTabParams& params) {
   return params.disposition;
 }

 void GetMiniContextMenuData(UINT cmd,
                             const MiniContextMenuParams& params,
                             GURL* referrer,
                             GURL* url) {
   *referrer = params.frame_url.is_empty() ? params.page_url : params.frame_url;
   *url = (cmd == IDS_CONTENT_CONTEXT_SAVELINKAS ?
       params.link_url : params.src_url);
 }

 }  // namespace chrome_frame

 ChromeFrameActivex::ChromeFrameActivex()
     : chrome_wndproc_hook_(NULL) {
   TRACE_EVENT_BEGIN_ETW("chromeframe.createactivex", this, "");
 }

 HRESULT ChromeFrameActivex::FinalConstruct() {
   HRESULT hr = Base::FinalConstruct();
   if (FAILED(hr))
     return hr;

   // No need to call FireOnChanged at this point since nobody will be listening.
   ready_state_ = READYSTATE_LOADING;
   return S_OK;
 }

 ChromeFrameActivex::~ChromeFrameActivex() {
   // We expect these to be released during a call to SetClientSite(NULL).
   DCHECK_EQ(0u, onmessage_.size());
   DCHECK_EQ(0u, onloaderror_.size());
   DCHECK_EQ(0u, onload_.size());
   DCHECK_EQ(0u, onreadystatechanged_.size());
   DCHECK_EQ(0u, onextensionready_.size());

   if (chrome_wndproc_hook_) {
     BOOL unhook_success = ::UnhookWindowsHookEx(chrome_wndproc_hook_);
     DCHECK(unhook_success);
   }

   // ChromeFramePlugin::Uninitialize()
   Base::Uninitialize();

   TRACE_EVENT_END_ETW("chromeframe.createactivex", this, "");
 }

 LRESULT ChromeFrameActivex::OnCreate(UINT message, WPARAM wparam, LPARAM lparam,
                                      BOOL& handled) {
   Base::OnCreate(message, wparam, lparam, handled);
   // Install the notification hook on the top-level window, so that we can
   // be notified on move events.  Note that the return value is not checked.
   // This hook is installed here, as opposed to during IOleObject_SetClientSite
   // because m_hWnd has not yet been assigned during the SetSite call.
   InstallTopLevelHook(m_spClientSite);
   return 0;
 }

 LRESULT ChromeFrameActivex::OnHostMoved(UINT message, WPARAM wparam,
                                         LPARAM lparam, BOOL& handled) {
   Base::OnHostMoved();
   return 0;
 }

 HRESULT ChromeFrameActivex::GetContainingDocument(IHTMLDocument2** doc) {
   base::win::ScopedComPtr<IOleContainer> container;
   HRESULT hr = m_spClientSite->GetContainer(container.Receive());
   if (container)
     hr = container.QueryInterface(doc);
   return hr;
 }

 HRESULT ChromeFrameActivex::GetDocumentWindow(IHTMLWindow2** window) {
   base::win::ScopedComPtr<IHTMLDocument2> document;
   HRESULT hr = GetContainingDocument(document.Receive());
   if (document)
     hr = document->get_parentWindow(window);
   return hr;
 }

 void ChromeFrameActivex::OnLoad(const GURL& gurl) {
   base::win::ScopedComPtr<IDispatch> event;
   std::string url = gurl.spec();
   if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
     Fire_onload(event);

   FireEvent(onload_, url);
   Base::OnLoad(gurl);
 }

 void ChromeFrameActivex::OnLoadFailed(int error_code, const std::string& url) {
   base::win::ScopedComPtr<IDispatch> event;
   if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
     Fire_onloaderror(event);

   FireEvent(onloaderror_, url);
   Base::OnLoadFailed(error_code, url);
 }

 void ChromeFrameActivex::OnMessageFromChromeFrame(const std::string& message,
                                                   const std::string& origin,
                                                   const std::string& target) {
   DVLOG(1) << __FUNCTION__;

   if (target.compare("*") != 0) {
     bool drop = true;

     if (is_privileged()) {
       // Forward messages if the control is in privileged mode.
       base::win::ScopedComPtr<IDispatch> message_event;
       if (SUCCEEDED(CreateDomEvent("message", message, origin,
                                    message_event.Receive()))) {
         base::win::ScopedBstr target_bstr(UTF8ToWide(target).c_str());
         Fire_onprivatemessage(message_event, target_bstr);

         FireEvent(onprivatemessage_, message_event, target_bstr);
       }
     } else {
       if (HaveSameOrigin(target, document_url_)) {
         drop = false;
       } else {
         DLOG(WARNING) << "Dropping posted message since target doesn't match "
             "the current document's origin. target=" << target;
       }
     }

     if (drop)
       return;
   }

   base::win::ScopedComPtr<IDispatch> message_event;
   if (SUCCEEDED(CreateDomEvent("message", message, origin,
                                message_event.Receive()))) {
     Fire_onmessage(message_event);

     FireEvent(onmessage_, message_event);

     base::win::ScopedVariant event_var;
     event_var.Set(static_cast<IDispatch*>(message_event));
     InvokeScriptFunction(onmessage_handler_, event_var.AsInput());
   }
 }

 bool ChromeFrameActivex::ShouldShowVersionMismatchDialog(
     bool is_privileged,
     IOleClientSite* client_site) {
   if (!is_privileged) {
     return true;
   }

   if (client_site) {
     base::win::ScopedComPtr<IChromeFramePrivileged> service;
     HRESULT hr = DoQueryService(SID_ChromeFramePrivileged,
                                 client_site,
                                 service.Receive());
     if (SUCCEEDED(hr) && service) {
       return (S_FALSE != service->ShouldShowVersionMismatchDialog());
     }
   }

   NOTREACHED();
   return true;
 }

 void ChromeFrameActivex::OnAutomationServerLaunchFailed(
     AutomationLaunchResult reason, const std::string& server_version) {
   Base::OnAutomationServerLaunchFailed(reason, server_version);

   if (reason == AUTOMATION_VERSION_MISMATCH &&
       ShouldShowVersionMismatchDialog(is_privileged(), m_spClientSite)) {
     UMA_HISTOGRAM_COUNTS("ChromeFrame.VersionMismatchDisplayed", 1);
     DisplayVersionMismatchWarning(m_hWnd, server_version);
   }
 }

 void ChromeFrameActivex::OnChannelError() {
   Fire_onchannelerror();
 }

 HRESULT ChromeFrameActivex::OnDraw(ATL_DRAWINFO& draw_info) {  // NOLINT
   HRESULT hr = S_OK;
   int dc_type = ::GetObjectType(draw_info.hicTargetDev);
   if (dc_type == OBJ_ENHMETADC) {
     RECT print_bounds = {0};
     print_bounds.left = draw_info.prcBounds->left;
     print_bounds.right = draw_info.prcBounds->right;
     print_bounds.top = draw_info.prcBounds->top;
     print_bounds.bottom = draw_info.prcBounds->bottom;

     automation_client_->Print(draw_info.hdcDraw, print_bounds);
   } else {
     hr = Base::OnDraw(draw_info);
   }

   return hr;
 }

 STDMETHODIMP ChromeFrameActivex::Load(IPropertyBag* bag, IErrorLog* error_log) {
   DCHECK(bag);

   const wchar_t* event_props[] = {
     (L"onload"),
     (L"onloaderror"),
     (L"onmessage"),
     (L"onreadystatechanged"),
   };

   base::win::ScopedComPtr<IHTMLObjectElement> obj_element;
   GetObjectElement(obj_element.Receive());

   base::win::ScopedBstr object_id;
   GetObjectScriptId(obj_element, object_id.Receive());

   base::win::ScopedComPtr<IHTMLElement2> element;
   element.QueryFrom(obj_element);
   HRESULT hr = S_OK;

   for (int i = 0; SUCCEEDED(hr) && i < arraysize(event_props); ++i) {
     base::win::ScopedBstr prop(event_props[i]);
     base::win::ScopedVariant value;
     if (SUCCEEDED(bag->Read(prop, value.Receive(), error_log))) {
       if (value.type() != VT_BSTR ||
           FAILED(hr = CreateScriptBlockForEvent(element, object_id,
                                                 V_BSTR(&value), prop))) {
         DLOG(ERROR) << "Failed to create script block for " << prop
                     << base::StringPrintf(L"hr=0x%08X, vt=%i", hr,
                                          value.type());
       } else {
         DVLOG(1) << "script block created for event " << prop
                  << base::StringPrintf(" (0x%08X)", hr) << " connections: " <<
             ProxyDIChromeFrameEvents<ChromeFrameActivex>::m_vec.GetSize();
       }
     } else {
       DVLOG(1) << "event property " << prop << " not in property bag";
     }
   }

   base::win::ScopedVariant src;
   if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"src"), src.Receive(),
                           error_log))) {
     if (src.type() == VT_BSTR) {
       hr = put_src(V_BSTR(&src));
       DCHECK(hr != E_UNEXPECTED);
     }
   }

   base::win::ScopedVariant use_chrome_network;
   if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"useChromeNetwork"),
                           use_chrome_network.Receive(), error_log))) {
     VariantChangeType(use_chrome_network.AsInput(),
                       use_chrome_network.AsInput(),
                       0, VT_BOOL);
     if (use_chrome_network.type() == VT_BOOL) {
       hr = put_useChromeNetwork(V_BOOL(&use_chrome_network));
       DCHECK(hr != E_UNEXPECTED);
     }
   }

   DLOG_IF(ERROR, FAILED(hr))
       << base::StringPrintf("Failed to load property bag: 0x%08X", hr);

   return hr;
 }

 const wchar_t g_activex_insecure_content_error[] = {
     L"data:text/html,<html><body><b>ChromeFrame Security Error<br><br>"
     L"Cannot navigate to HTTP url when document URL is HTTPS</body></html>"};

 STDMETHODIMP ChromeFrameActivex::put_src(BSTR src) {
   GURL document_url(GetDocumentUrl());
   if (document_url.SchemeIsSecure()) {
     GURL source_url(src);
     if (!source_url.SchemeIsSecure()) {
       Base::put_src(base::win::ScopedBstr(g_activex_insecure_content_error));
       return E_ACCESSDENIED;
     }
   }
   return Base::put_src(src);
 }

 HRESULT ChromeFrameActivex::IOleObject_SetClientSite(
     IOleClientSite* client_site) {
   HRESULT hr = Base::IOleObject_SetClientSite(client_site);
   if (FAILED(hr) || !client_site) {
     EventHandlers* handlers[] = {
       &onmessage_,
       &onloaderror_,
       &onload_,
       &onreadystatechanged_,
       &onextensionready_,
     };

     for (int i = 0; i < arraysize(handlers); ++i)
       handlers[i]->clear();

     // Drop privileged mode on uninitialization.
     set_is_privileged(false);
   } else {
     base::win::ScopedComPtr<IHTMLDocument2> document;
     GetContainingDocument(document.Receive());
     if (document) {
       base::win::ScopedBstr url;
       if (SUCCEEDED(document->get_URL(url.Receive())))
         WideToUTF8(url, url.Length(), &document_url_);
     }

     // Probe to see whether the host implements the privileged service.
     base::win::ScopedComPtr<IChromeFramePrivileged> service;
     HRESULT service_hr = DoQueryService(SID_ChromeFramePrivileged,
                                         m_spClientSite,
                                         service.Receive());
     if (SUCCEEDED(service_hr) && service) {
       // Does the host want privileged mode?
       boolean wants_privileged = false;
       service_hr = service->GetWantsPrivileged(&wants_privileged);

       if (SUCCEEDED(service_hr) && wants_privileged)
         set_is_privileged(true);

       url_fetcher_->set_privileged_mode(is_privileged());
     }

     std::wstring profile_name(GetHostProcessName(false));
     if (is_privileged()) {
       base::win::ScopedBstr profile_name_arg;
       service_hr = service->GetChromeProfileName(profile_name_arg.Receive());
       if (S_OK == service_hr && profile_name_arg)
         profile_name.assign(profile_name_arg, profile_name_arg.Length());
     }

     std::string utf8_url;
     if (url_.Length()) {
       WideToUTF8(url_, url_.Length(), &utf8_url);
     }

     InitializeAutomationSettings();

     // To avoid http://code.google.com/p/chromium/issues/detail?id=63427,
     // we always pass this flag needed by CEEE. It has no effect on
     // normal CF operation.
     //
     // Extra arguments are passed on verbatim, so we add the -- prefix.
     std::wstring chrome_extra_arguments(L"--");
     chrome_extra_arguments.append(
         ASCIIToWide(switches::kEnableExperimentalExtensionApis));

     url_fetcher_->set_frame_busting(!is_privileged());
     automation_client_->SetUrlFetcher(url_fetcher_.get());
     if (!InitializeAutomation(profile_name, chrome_extra_arguments,
                               IsIEInPrivate(), true, GURL(utf8_url),
                               GURL(), false)) {
       DLOG(ERROR) << "Failed to navigate to url:" << utf8_url;
       return E_FAIL;
     }

     // Log a metric that Chrome Frame is being used in Widget mode
     UMA_LAUNCH_TYPE_COUNT(RENDERER_TYPE_CHROME_WIDGET);
   }

   return hr;
 }

 HRESULT ChromeFrameActivex::GetObjectScriptId(IHTMLObjectElement* object_elem,
                                               BSTR* id) {
   DCHECK(object_elem != NULL);
   DCHECK(id != NULL);

   HRESULT hr = E_FAIL;
   if (object_elem) {
     base::win::ScopedComPtr<IHTMLElement> elem;
     hr = elem.QueryFrom(object_elem);
     if (elem) {
       hr = elem->get_id(id);
     }
   }

   return hr;
 }

 HRESULT ChromeFrameActivex::GetObjectElement(IHTMLObjectElement** element) {
   DCHECK(m_spClientSite);
   if (!m_spClientSite)
     return E_UNEXPECTED;

   base::win::ScopedComPtr<IOleControlSite> site;
   HRESULT hr = site.QueryFrom(m_spClientSite);
   if (site) {
     base::win::ScopedComPtr<IDispatch> disp;
     hr = site->GetExtendedControl(disp.Receive());
     if (disp) {
       hr = disp.QueryInterface(element);
     } else {
       DCHECK(FAILED(hr));
     }
   }

   return hr;
 }

 HRESULT ChromeFrameActivex::CreateScriptBlockForEvent(
     IHTMLElement2* insert_after, BSTR instance_id, BSTR script,
     BSTR event_name) {
   DCHECK(insert_after);
   DCHECK_GT(::SysStringLen(event_name), 0UL);  // should always have this

   // This might be 0 if not specified in the HTML document.
   if (!::SysStringLen(instance_id)) {
     // TODO(tommi): Should we give ourselves an ID if this happens?
     NOTREACHED() << "Need to handle this";
     return E_INVALIDARG;
   }

   base::win::ScopedComPtr<IHTMLDocument2> document;
   HRESULT hr = GetContainingDocument(document.Receive());
   if (SUCCEEDED(hr)) {
     base::win::ScopedComPtr<IHTMLElement> element, new_element;
     document->createElement(base::win::ScopedBstr(L"script"),
                             element.Receive());
     if (element) {
       base::win::ScopedComPtr<IHTMLScriptElement> script_element;
       if (SUCCEEDED(hr = script_element.QueryFrom(element))) {
         script_element->put_htmlFor(instance_id);
         script_element->put_event(event_name);
         script_element->put_text(script);

         hr = insert_after->insertAdjacentElement(
             base::win::ScopedBstr(L"afterEnd"),
             element,
             new_element.Receive());
       }
     }
   }

   return hr;
 }

 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
                                    const std::string& arg) {
   if (handlers.size()) {
     base::win::ScopedComPtr<IDispatch> event;
     if (SUCCEEDED(CreateDomEvent("event", arg, "", event.Receive()))) {
       FireEvent(handlers, event);
     }
   }
 }

 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
                                    IDispatch* event) {
   DCHECK(event != NULL);
   VARIANT arg = { VT_DISPATCH };
   arg.pdispVal = event;
   DISPPARAMS params = { &arg, NULL, 1, 0 };
   for (EventHandlers::const_iterator it = handlers.begin();
        it != handlers.end();
        ++it) {
     HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
                                DISPATCH_METHOD, &params, NULL, NULL, NULL);
     // 0x80020101 == SCRIPT_E_REPORTED.
     // When the script we're invoking has an error, we get this error back.
     DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
         << base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
   }
 }

 void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
                                    IDispatch* event, BSTR target) {
   DCHECK(event != NULL);
   // Arguments in reverse order to event handler function declaration,
   // because that's what DISPPARAMS requires.
   VARIANT args[2] = { { VT_BSTR }, { VT_DISPATCH }, };
   args[0].bstrVal = target;
   args[1].pdispVal = event;
   DISPPARAMS params = { args, NULL, arraysize(args), 0 };
   for (EventHandlers::const_iterator it = handlers.begin();
        it != handlers.end();
        ++it) {
     HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
                                DISPATCH_METHOD, &params, NULL, NULL, NULL);
     // 0x80020101 == SCRIPT_E_REPORTED.
     // When the script we're invoking has an error, we get this error back.
     DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
         << base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
   }
 }

 HRESULT ChromeFrameActivex::InstallTopLevelHook(IOleClientSite* client_site) {
   // Get the parent window of the site, and install our hook on the topmost
   // window of the parent.
   base::win::ScopedComPtr<IOleWindow> ole_window;
   HRESULT hr = ole_window.QueryFrom(client_site);
   if (FAILED(hr))
     return hr;

   HWND parent_wnd;
   hr = ole_window->GetWindow(&parent_wnd);
   if (FAILED(hr))
     return hr;

   HWND top_window = ::GetAncestor(parent_wnd, GA_ROOT);
   chrome_wndproc_hook_ = InstallLocalWindowHook(top_window);
   if (chrome_wndproc_hook_)
     TopLevelWindowMapping::GetInstance()->AddMapping(top_window, m_hWnd);

   return chrome_wndproc_hook_ ? S_OK : E_FAIL;
 }

 HRESULT ChromeFrameActivex::registerBhoIfNeeded() {
   if (!m_spUnkSite) {
     NOTREACHED() << "Invalid client site";
     return E_FAIL;
   }

   if (NavigationManager::GetThreadInstance() != NULL) {
     DVLOG(1) << "BHO already loaded";
     return S_OK;
   }

   base::win::ScopedComPtr<IWebBrowser2> web_browser2;
   HRESULT hr = DoQueryService(SID_SWebBrowserApp, m_spUnkSite,
                               web_browser2.Receive());
   if (FAILED(hr) || web_browser2.get() == NULL) {
     DLOG(WARNING) << "Failed to get IWebBrowser2 from client site. Error:"
                   << base::StringPrintf(" 0x%08X", hr);
     return hr;
   }

   wchar_t bho_class_id_as_string[MAX_PATH] = {0};
   StringFromGUID2(CLSID_ChromeFrameBHO, bho_class_id_as_string,
                   arraysize(bho_class_id_as_string));

   base::win::ScopedComPtr<IObjectWithSite> bho;
   hr = bho.CreateInstance(CLSID_ChromeFrameBHO, NULL, CLSCTX_INPROC_SERVER);
   if (FAILED(hr)) {
     NOTREACHED() << "Failed to register ChromeFrame BHO. Error:"
                  << base::StringPrintf(" 0x%08X", hr);
     return hr;
   }

   hr = UrlMkSetSessionOption(URLMON_OPTION_USERAGENT_REFRESH, NULL, 0, 0);
   if (FAILED(hr)) {
     DLOG(ERROR) << "Failed to refresh user agent string from registry. "
                 << "UrlMkSetSessionOption returned "
                 << base::StringPrintf("0x%08x", hr);
     return hr;
   }

   hr = bho->SetSite(web_browser2);
   if (FAILED(hr)) {
     NOTREACHED() << "ChromeFrame BHO SetSite failed. Error:"
                  << base::StringPrintf(" 0x%08X", hr);
     return hr;
   }

   web_browser2->PutProperty(base::win::ScopedBstr(bho_class_id_as_string),
                             base::win::ScopedVariant(bho));
   return S_OK;
 }
	// Copyright (c) 2011 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 "chrome_frame/chrome_frame_activex.h"

	#include <wininet.h>

	#include <algorithm>
	#include <map>

	#include "base/basictypes.h"
	#include "base/command_line.h"
	#include "base/debug/trace_event.h"
	#include "base/file_util.h"
	#include "base/logging.h"
	#include "base/memory/singleton.h"
	#include "base/path_service.h"
	#include "base/process_util.h"
	#include "base/string_split.h"
	#include "base/string_util.h"
	#include "base/stringprintf.h"
	#include "base/utf_string_conversions.h"
	#include "base/win/scoped_bstr.h"
	#include "base/win/scoped_variant.h"
	#include "chrome/common/automation_messages.h"
	#include "chrome/common/chrome_constants.h"
	#include "chrome/common/chrome_switches.h"
	#include "chrome/test/automation/tab_proxy.h"
	#include "chrome_frame/utils.h"
	#include "googleurl/src/gurl.h"

	namespace {

	// Class used to maintain a mapping from top-level windows to ChromeFrameActivex
	// instances.
	class TopLevelWindowMapping {
	public:
	typedef std::vector<HWND> WindowList;

	static TopLevelWindowMapping* GetInstance() {
	return Singleton<TopLevelWindowMapping>::get();
	}

	// Add \|cf_window\| to the set of windows registered under \|top_window\|.
	void AddMapping(HWND top_window, HWND cf_window) {
	top_window_map_lock_.Lock();
	top_window_map_[top_window].push_back(cf_window);
	top_window_map_lock_.Unlock();
	}

	// Return the set of Chrome-Frame instances under \|window\|.
	WindowList GetInstances(HWND window) {
	top_window_map_lock_.Lock();
	WindowList list = top_window_map_[window];
	top_window_map_lock_.Unlock();
	return list;
	}

	private:
	// Constructor is private as this class it to be used as a singleton.
	// See static method instance().
	TopLevelWindowMapping() {}

	friend struct DefaultSingletonTraits<TopLevelWindowMapping>;

	typedef std::map<HWND, WindowList> TopWindowMap;
	TopWindowMap top_window_map_;

	CComAutoCriticalSection top_window_map_lock_;

	DISALLOW_COPY_AND_ASSIGN(TopLevelWindowMapping);
	};

	// Message pump hook function that monitors for WM_MOVE and WM_MOVING
	// messages on a top-level window, and passes notification to the appropriate
	// Chrome-Frame instances.
	LRESULT CALLBACK TopWindowProc(int code, WPARAM wparam, LPARAM lparam) {
	CWPSTRUCT info = reinterpret_cast<CWPSTRUCT>(lparam);
	const UINT &message = info->message;
	const HWND &message_hwnd = info->hwnd;

	switch (message) {
	case WM_MOVE:
	case WM_MOVING: {
	TopLevelWindowMapping::WindowList cf_instances =
	TopLevelWindowMapping::GetInstance()->GetInstances(message_hwnd);
	TopLevelWindowMapping::WindowList::iterator
	iter(cf_instances.begin()), end(cf_instances.end());
	for (;iter != end; ++iter) {
	PostMessage(*iter, WM_HOST_MOVED_NOTIFICATION, NULL, NULL);
	}
	break;
	}
	default:
	break;
	}

	return CallNextHookEx(0, code, wparam, lparam);
	}

	HHOOK InstallLocalWindowHook(HWND window) {
	if (!window)
	return NULL;

	DWORD proc_thread = ::GetWindowThreadProcessId(window, NULL);
	if (!proc_thread)
	return NULL;

	// Note that this hook is installed as a LOCAL hook.
	return ::SetWindowsHookEx(WH_CALLWNDPROC,
	TopWindowProc,
	NULL,
	proc_thread);
	}

	} // unnamed namespace

	namespace chrome_frame {
	std::string ActiveXCreateUrl(const GURL& parsed_url,
	const AttachExternalTabParams& params) {
	return base::StringPrintf(
	"%hs?attach_external_tab&%I64u&%d&%d&%d&%d&%d&%hs",
	parsed_url.GetOrigin().spec().c_str(),
	params.cookie,
	params.disposition,
	params.dimensions.x(),
	params.dimensions.y(),
	params.dimensions.width(),
	params.dimensions.height(),
	params.profile_name.c_str());
	}

	int GetDisposition(const AttachExternalTabParams& params) {
	return params.disposition;
	}

	void GetMiniContextMenuData(UINT cmd,
	const MiniContextMenuParams& params,
	GURL* referrer,
	GURL* url) {
	*referrer = params.frame_url.is_empty() ? params.page_url : params.frame_url;
	*url = (cmd == IDS_CONTENT_CONTEXT_SAVELINKAS ?
	params.link_url : params.src_url);
	}

	} // namespace chrome_frame

	ChromeFrameActivex::ChromeFrameActivex()
	: chrome_wndproc_hook_(NULL) {
	TRACE_EVENT_BEGIN_ETW("chromeframe.createactivex", this, "");
	}

	HRESULT ChromeFrameActivex::FinalConstruct() {
	HRESULT hr = Base::FinalConstruct();
	if (FAILED(hr))
	return hr;

	// No need to call FireOnChanged at this point since nobody will be listening.
	ready_state_ = READYSTATE_LOADING;
	return S_OK;
	}

	ChromeFrameActivex::~ChromeFrameActivex() {
	// We expect these to be released during a call to SetClientSite(NULL).
	DCHECK_EQ(0u, onmessage_.size());
	DCHECK_EQ(0u, onloaderror_.size());
	DCHECK_EQ(0u, onload_.size());
	DCHECK_EQ(0u, onreadystatechanged_.size());
	DCHECK_EQ(0u, onextensionready_.size());

	if (chrome_wndproc_hook_) {
	BOOL unhook_success = ::UnhookWindowsHookEx(chrome_wndproc_hook_);
	DCHECK(unhook_success);
	}

	// ChromeFramePlugin::Uninitialize()
	Base::Uninitialize();

	TRACE_EVENT_END_ETW("chromeframe.createactivex", this, "");
	}

	LRESULT ChromeFrameActivex::OnCreate(UINT message, WPARAM wparam, LPARAM lparam,
	BOOL& handled) {
	Base::OnCreate(message, wparam, lparam, handled);
	// Install the notification hook on the top-level window, so that we can
	// be notified on move events. Note that the return value is not checked.
	// This hook is installed here, as opposed to during IOleObject_SetClientSite
	// because m_hWnd has not yet been assigned during the SetSite call.
	InstallTopLevelHook(m_spClientSite);
	return 0;
	}

	LRESULT ChromeFrameActivex::OnHostMoved(UINT message, WPARAM wparam,
	LPARAM lparam, BOOL& handled) {
	Base::OnHostMoved();
	return 0;
	}

	HRESULT ChromeFrameActivex::GetContainingDocument(IHTMLDocument2** doc) {
	base::win::ScopedComPtr<IOleContainer> container;
	HRESULT hr = m_spClientSite->GetContainer(container.Receive());
	if (container)
	hr = container.QueryInterface(doc);
	return hr;
	}

	HRESULT ChromeFrameActivex::GetDocumentWindow(IHTMLWindow2** window) {
	base::win::ScopedComPtr<IHTMLDocument2> document;
	HRESULT hr = GetContainingDocument(document.Receive());
	if (document)
	hr = document->get_parentWindow(window);
	return hr;
	}

	void ChromeFrameActivex::OnLoad(const GURL& gurl) {
	base::win::ScopedComPtr<IDispatch> event;
	std::string url = gurl.spec();
	if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
	Fire_onload(event);

	FireEvent(onload_, url);
	Base::OnLoad(gurl);
	}

	void ChromeFrameActivex::OnLoadFailed(int error_code, const std::string& url) {
	base::win::ScopedComPtr<IDispatch> event;
	if (SUCCEEDED(CreateDomEvent("event", url, "", event.Receive())))
	Fire_onloaderror(event);

	FireEvent(onloaderror_, url);
	Base::OnLoadFailed(error_code, url);
	}

	void ChromeFrameActivex::OnMessageFromChromeFrame(const std::string& message,
	const std::string& origin,
	const std::string& target) {
	DVLOG(1) << __FUNCTION__;

	if (target.compare("*") != 0) {
	bool drop = true;

	if (is_privileged()) {
	// Forward messages if the control is in privileged mode.
	base::win::ScopedComPtr<IDispatch> message_event;
	if (SUCCEEDED(CreateDomEvent("message", message, origin,
	message_event.Receive()))) {
	base::win::ScopedBstr target_bstr(UTF8ToWide(target).c_str());
	Fire_onprivatemessage(message_event, target_bstr);

	FireEvent(onprivatemessage_, message_event, target_bstr);
	}
	} else {
	if (HaveSameOrigin(target, document_url_)) {
	drop = false;
	} else {
	DLOG(WARNING) << "Dropping posted message since target doesn't match "
	"the current document's origin. target=" << target;
	}
	}

	if (drop)
	return;
	}

	base::win::ScopedComPtr<IDispatch> message_event;
	if (SUCCEEDED(CreateDomEvent("message", message, origin,
	message_event.Receive()))) {
	Fire_onmessage(message_event);

	FireEvent(onmessage_, message_event);

	base::win::ScopedVariant event_var;
	event_var.Set(static_cast<IDispatch*>(message_event));
	InvokeScriptFunction(onmessage_handler_, event_var.AsInput());
	}
	}

	bool ChromeFrameActivex::ShouldShowVersionMismatchDialog(
	bool is_privileged,
	IOleClientSite* client_site) {
	if (!is_privileged) {
	return true;
	}

	if (client_site) {
	base::win::ScopedComPtr<IChromeFramePrivileged> service;
	HRESULT hr = DoQueryService(SID_ChromeFramePrivileged,
	client_site,
	service.Receive());
	if (SUCCEEDED(hr) && service) {
	return (S_FALSE != service->ShouldShowVersionMismatchDialog());
	}
	}

	NOTREACHED();
	return true;
	}

	void ChromeFrameActivex::OnAutomationServerLaunchFailed(
	AutomationLaunchResult reason, const std::string& server_version) {
	Base::OnAutomationServerLaunchFailed(reason, server_version);

	if (reason == AUTOMATION_VERSION_MISMATCH &&
	ShouldShowVersionMismatchDialog(is_privileged(), m_spClientSite)) {
	UMA_HISTOGRAM_COUNTS("ChromeFrame.VersionMismatchDisplayed", 1);
	DisplayVersionMismatchWarning(m_hWnd, server_version);
	}
	}

	void ChromeFrameActivex::OnChannelError() {
	Fire_onchannelerror();
	}

	HRESULT ChromeFrameActivex::OnDraw(ATL_DRAWINFO& draw_info) { // NOLINT
	HRESULT hr = S_OK;
	int dc_type = ::GetObjectType(draw_info.hicTargetDev);
	if (dc_type == OBJ_ENHMETADC) {
	RECT print_bounds = {0};
	print_bounds.left = draw_info.prcBounds->left;
	print_bounds.right = draw_info.prcBounds->right;
	print_bounds.top = draw_info.prcBounds->top;
	print_bounds.bottom = draw_info.prcBounds->bottom;

	automation_client_->Print(draw_info.hdcDraw, print_bounds);
	} else {
	hr = Base::OnDraw(draw_info);
	}

	return hr;
	}

	STDMETHODIMP ChromeFrameActivex::Load(IPropertyBag* bag, IErrorLog* error_log) {
	DCHECK(bag);

	const wchar_t* event_props[] = {
	(L"onload"),
	(L"onloaderror"),
	(L"onmessage"),
	(L"onreadystatechanged"),
	};

	base::win::ScopedComPtr<IHTMLObjectElement> obj_element;
	GetObjectElement(obj_element.Receive());

	base::win::ScopedBstr object_id;
	GetObjectScriptId(obj_element, object_id.Receive());

	base::win::ScopedComPtr<IHTMLElement2> element;
	element.QueryFrom(obj_element);
	HRESULT hr = S_OK;

	for (int i = 0; SUCCEEDED(hr) && i < arraysize(event_props); ++i) {
	base::win::ScopedBstr prop(event_props[i]);
	base::win::ScopedVariant value;
	if (SUCCEEDED(bag->Read(prop, value.Receive(), error_log))) {
	if (value.type() != VT_BSTR \|\|
	FAILED(hr = CreateScriptBlockForEvent(element, object_id,
	V_BSTR(&value), prop))) {
	DLOG(ERROR) << "Failed to create script block for " << prop
	<< base::StringPrintf(L"hr=0x%08X, vt=%i", hr,
	value.type());
	} else {
	DVLOG(1) << "script block created for event " << prop
	<< base::StringPrintf(" (0x%08X)", hr) << " connections: " <<
	ProxyDIChromeFrameEvents<ChromeFrameActivex>::m_vec.GetSize();
	}
	} else {
	DVLOG(1) << "event property " << prop << " not in property bag";
	}
	}

	base::win::ScopedVariant src;
	if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"src"), src.Receive(),
	error_log))) {
	if (src.type() == VT_BSTR) {
	hr = put_src(V_BSTR(&src));
	DCHECK(hr != E_UNEXPECTED);
	}
	}

	base::win::ScopedVariant use_chrome_network;
	if (SUCCEEDED(bag->Read(base::win::ScopedBstr(L"useChromeNetwork"),
	use_chrome_network.Receive(), error_log))) {
	VariantChangeType(use_chrome_network.AsInput(),
	use_chrome_network.AsInput(),
	0, VT_BOOL);
	if (use_chrome_network.type() == VT_BOOL) {
	hr = put_useChromeNetwork(V_BOOL(&use_chrome_network));
	DCHECK(hr != E_UNEXPECTED);
	}
	}

	DLOG_IF(ERROR, FAILED(hr))
	<< base::StringPrintf("Failed to load property bag: 0x%08X", hr);

	return hr;
	}

	const wchar_t g_activex_insecure_content_error[] = {
	L"data:text/html,<html><body><b>ChromeFrame Security Error<br><br>"
	L"Cannot navigate to HTTP url when document URL is HTTPS</body></html>"};

	STDMETHODIMP ChromeFrameActivex::put_src(BSTR src) {
	GURL document_url(GetDocumentUrl());
	if (document_url.SchemeIsSecure()) {
	GURL source_url(src);
	if (!source_url.SchemeIsSecure()) {
	Base::put_src(base::win::ScopedBstr(g_activex_insecure_content_error));
	return E_ACCESSDENIED;
	}
	}
	return Base::put_src(src);
	}

	HRESULT ChromeFrameActivex::IOleObject_SetClientSite(
	IOleClientSite* client_site) {
	HRESULT hr = Base::IOleObject_SetClientSite(client_site);
	if (FAILED(hr) \|\| !client_site) {
	EventHandlers* handlers[] = {
	&onmessage_,
	&onloaderror_,
	&onload_,
	&onreadystatechanged_,
	&onextensionready_,
	};

	for (int i = 0; i < arraysize(handlers); ++i)
	handlers[i]->clear();

	// Drop privileged mode on uninitialization.
	set_is_privileged(false);
	} else {
	base::win::ScopedComPtr<IHTMLDocument2> document;
	GetContainingDocument(document.Receive());
	if (document) {
	base::win::ScopedBstr url;
	if (SUCCEEDED(document->get_URL(url.Receive())))
	WideToUTF8(url, url.Length(), &document_url_);
	}

	// Probe to see whether the host implements the privileged service.
	base::win::ScopedComPtr<IChromeFramePrivileged> service;
	HRESULT service_hr = DoQueryService(SID_ChromeFramePrivileged,
	m_spClientSite,
	service.Receive());
	if (SUCCEEDED(service_hr) && service) {
	// Does the host want privileged mode?
	boolean wants_privileged = false;
	service_hr = service->GetWantsPrivileged(&wants_privileged);

	if (SUCCEEDED(service_hr) && wants_privileged)
	set_is_privileged(true);

	url_fetcher_->set_privileged_mode(is_privileged());
	}

	std::wstring profile_name(GetHostProcessName(false));
	if (is_privileged()) {
	base::win::ScopedBstr profile_name_arg;
	service_hr = service->GetChromeProfileName(profile_name_arg.Receive());
	if (S_OK == service_hr && profile_name_arg)
	profile_name.assign(profile_name_arg, profile_name_arg.Length());
	}

	std::string utf8_url;
	if (url_.Length()) {
	WideToUTF8(url_, url_.Length(), &utf8_url);
	}

	InitializeAutomationSettings();

	// To avoid http://code.google.com/p/chromium/issues/detail?id=63427,
	// we always pass this flag needed by CEEE. It has no effect on
	// normal CF operation.
	//
	// Extra arguments are passed on verbatim, so we add the -- prefix.
	std::wstring chrome_extra_arguments(L"--");
	chrome_extra_arguments.append(
	ASCIIToWide(switches::kEnableExperimentalExtensionApis));

	url_fetcher_->set_frame_busting(!is_privileged());
	automation_client_->SetUrlFetcher(url_fetcher_.get());
	if (!InitializeAutomation(profile_name, chrome_extra_arguments,
	IsIEInPrivate(), true, GURL(utf8_url),
	GURL(), false)) {
	DLOG(ERROR) << "Failed to navigate to url:" << utf8_url;
	return E_FAIL;
	}

	// Log a metric that Chrome Frame is being used in Widget mode
	UMA_LAUNCH_TYPE_COUNT(RENDERER_TYPE_CHROME_WIDGET);
	}

	return hr;
	}

	HRESULT ChromeFrameActivex::GetObjectScriptId(IHTMLObjectElement* object_elem,
	BSTR* id) {
	DCHECK(object_elem != NULL);
	DCHECK(id != NULL);

	HRESULT hr = E_FAIL;
	if (object_elem) {
	base::win::ScopedComPtr<IHTMLElement> elem;
	hr = elem.QueryFrom(object_elem);
	if (elem) {
	hr = elem->get_id(id);
	}
	}

	return hr;
	}

	HRESULT ChromeFrameActivex::GetObjectElement(IHTMLObjectElement** element) {
	DCHECK(m_spClientSite);
	if (!m_spClientSite)
	return E_UNEXPECTED;

	base::win::ScopedComPtr<IOleControlSite> site;
	HRESULT hr = site.QueryFrom(m_spClientSite);
	if (site) {
	base::win::ScopedComPtr<IDispatch> disp;
	hr = site->GetExtendedControl(disp.Receive());
	if (disp) {
	hr = disp.QueryInterface(element);
	} else {
	DCHECK(FAILED(hr));
	}
	}

	return hr;
	}

	HRESULT ChromeFrameActivex::CreateScriptBlockForEvent(
	IHTMLElement2* insert_after, BSTR instance_id, BSTR script,
	BSTR event_name) {
	DCHECK(insert_after);
	DCHECK_GT(::SysStringLen(event_name), 0UL); // should always have this

	// This might be 0 if not specified in the HTML document.
	if (!::SysStringLen(instance_id)) {
	// TODO(tommi): Should we give ourselves an ID if this happens?
	NOTREACHED() << "Need to handle this";
	return E_INVALIDARG;
	}

	base::win::ScopedComPtr<IHTMLDocument2> document;
	HRESULT hr = GetContainingDocument(document.Receive());
	if (SUCCEEDED(hr)) {
	base::win::ScopedComPtr<IHTMLElement> element, new_element;
	document->createElement(base::win::ScopedBstr(L"script"),
	element.Receive());
	if (element) {
	base::win::ScopedComPtr<IHTMLScriptElement> script_element;
	if (SUCCEEDED(hr = script_element.QueryFrom(element))) {
	script_element->put_htmlFor(instance_id);
	script_element->put_event(event_name);
	script_element->put_text(script);

	hr = insert_after->insertAdjacentElement(
	base::win::ScopedBstr(L"afterEnd"),
	element,
	new_element.Receive());
	}
	}
	}

	return hr;
	}

	void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
	const std::string& arg) {
	if (handlers.size()) {
	base::win::ScopedComPtr<IDispatch> event;
	if (SUCCEEDED(CreateDomEvent("event", arg, "", event.Receive()))) {
	FireEvent(handlers, event);
	}
	}
	}

	void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
	IDispatch* event) {
	DCHECK(event != NULL);
	VARIANT arg = { VT_DISPATCH };
	arg.pdispVal = event;
	DISPPARAMS params = { &arg, NULL, 1, 0 };
	for (EventHandlers::const_iterator it = handlers.begin();
	it != handlers.end();
	++it) {
	HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
	DISPATCH_METHOD, &params, NULL, NULL, NULL);
	// 0x80020101 == SCRIPT_E_REPORTED.
	// When the script we're invoking has an error, we get this error back.
	DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
	<< base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
	}
	}

	void ChromeFrameActivex::FireEvent(const EventHandlers& handlers,
	IDispatch* event, BSTR target) {
	DCHECK(event != NULL);
	// Arguments in reverse order to event handler function declaration,
	// because that's what DISPPARAMS requires.
	VARIANT args[2] = { { VT_BSTR }, { VT_DISPATCH }, };
	args[0].bstrVal = target;
	args[1].pdispVal = event;
	DISPPARAMS params = { args, NULL, arraysize(args), 0 };
	for (EventHandlers::const_iterator it = handlers.begin();
	it != handlers.end();
	++it) {
	HRESULT hr = (*it)->Invoke(DISPID_VALUE, IID_NULL, LOCALE_USER_DEFAULT,
	DISPATCH_METHOD, &params, NULL, NULL, NULL);
	// 0x80020101 == SCRIPT_E_REPORTED.
	// When the script we're invoking has an error, we get this error back.
	DLOG_IF(ERROR, FAILED(hr) && hr != 0x80020101)
	<< base::StringPrintf(L"Failed to invoke script: 0x%08X", hr);
	}
	}

	HRESULT ChromeFrameActivex::InstallTopLevelHook(IOleClientSite* client_site) {
	// Get the parent window of the site, and install our hook on the topmost
	// window of the parent.
	base::win::ScopedComPtr<IOleWindow> ole_window;
	HRESULT hr = ole_window.QueryFrom(client_site);
	if (FAILED(hr))
	return hr;

	HWND parent_wnd;
	hr = ole_window->GetWindow(&parent_wnd);
	if (FAILED(hr))
	return hr;

	HWND top_window = ::GetAncestor(parent_wnd, GA_ROOT);
	chrome_wndproc_hook_ = InstallLocalWindowHook(top_window);
	if (chrome_wndproc_hook_)
	TopLevelWindowMapping::GetInstance()->AddMapping(top_window, m_hWnd);

	return chrome_wndproc_hook_ ? S_OK : E_FAIL;
	}

	HRESULT ChromeFrameActivex::registerBhoIfNeeded() {
	if (!m_spUnkSite) {
	NOTREACHED() << "Invalid client site";
	return E_FAIL;
	}

	if (NavigationManager::GetThreadInstance() != NULL) {
	DVLOG(1) << "BHO already loaded";
	return S_OK;
	}

	base::win::ScopedComPtr<IWebBrowser2> web_browser2;
	HRESULT hr = DoQueryService(SID_SWebBrowserApp, m_spUnkSite,
	web_browser2.Receive());
	if (FAILED(hr) \|\| web_browser2.get() == NULL) {
	DLOG(WARNING) << "Failed to get IWebBrowser2 from client site. Error:"
	<< base::StringPrintf(" 0x%08X", hr);
	return hr;
	}

	wchar_t bho_class_id_as_string[MAX_PATH] = {0};
	StringFromGUID2(CLSID_ChromeFrameBHO, bho_class_id_as_string,
	arraysize(bho_class_id_as_string));

	base::win::ScopedComPtr<IObjectWithSite> bho;
	hr = bho.CreateInstance(CLSID_ChromeFrameBHO, NULL, CLSCTX_INPROC_SERVER);
	if (FAILED(hr)) {
	NOTREACHED() << "Failed to register ChromeFrame BHO. Error:"
	<< base::StringPrintf(" 0x%08X", hr);
	return hr;
	}

	hr = UrlMkSetSessionOption(URLMON_OPTION_USERAGENT_REFRESH, NULL, 0, 0);
	if (FAILED(hr)) {
	DLOG(ERROR) << "Failed to refresh user agent string from registry. "
	<< "UrlMkSetSessionOption returned "
	<< base::StringPrintf("0x%08x", hr);
	return hr;
	}

	hr = bho->SetSite(web_browser2);
	if (FAILED(hr)) {
	NOTREACHED() << "ChromeFrame BHO SetSite failed. Error:"
	<< base::StringPrintf(" 0x%08X", hr);
	return hr;
	}

	web_browser2->PutProperty(base::win::ScopedBstr(bho_class_id_as_string),
	base::win::ScopedVariant(bho));
	return S_OK;
	}