- Factor platform-specific code out of CefBrowserHostImpl (issue #1749).

- Introduce native/ and osr/ folders for native (non-platform-agnostic) and
    osr (windowless) code respectively.
  - Introduce CefBrowserPlatformDelegate for abstracting platform-specific
    implementations of browser host functionality.
  - Move dialog and menu code to separate manager and platform-specific runner
    implementations exposed via CefBrowserPlatformDelegate.
  - Standardize focus-handling behavior between windowed and windowless
    implementations. CefFocusHandler::OnSetFocus() will now also be called for
    osr focus changes.
- Support multiple simultaneous popups (issue #1289).

libcef/renderer/content_renderer_client.h

@@ -34,6 +34,7 @@ namespace web_cache {
 class WebCacheRenderProcessObserver;
 }
 
+class CefGuestView;
 class CefRenderProcessObserver;
 struct Cef_CrossOriginWhiteListEntry_Params;
 struct CefViewHostMsg_GetPluginInfo_Output;
@@ -58,6 +59,12 @@ class CefContentRendererClient : public content::ContentRendererClient,
   // Called from CefBrowserImpl::OnDestruct().
   void OnBrowserDestroyed(CefBrowserImpl* browser);
 
+  // Returns true if a guest view associated with the specified RenderView.
+  bool HasGuestViewForView(content::RenderView* view);
+
+  // Called from CefGuestView::OnDestruct().
+  void OnGuestViewDestroyed(CefGuestView* guest_view);
+
   // Render thread task runner.
   base::SequencedTaskRunner* render_task_runner() const {
     return render_task_runner_.get();
@@ -143,6 +150,10 @@ class CefContentRendererClient : public content::ContentRendererClient,
   typedef std::map<content::RenderView*, CefRefPtr<CefBrowserImpl> > BrowserMap;
   BrowserMap browsers_;
 
+  // Map of RenderView poiners to CefGuestView implementations.
+  typedef std::map<content::RenderView*, CefGuestView* > GuestViewMap;
+  GuestViewMap guest_views_;
+
   // Cross-origin white list entries that need to be registered with WebKit.
   typedef std::vector<Cef_CrossOriginWhiteListEntry_Params> CrossOriginList;
   CrossOriginList cross_origin_whitelist_entries_;