Make <webview> use out-of-process iframe architecture.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index f8004d9f901b5238f68cdf25745bcf83bbf1da14..7665c0feb0a9b4d2ca325f90558fca12d69f0d58 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -173,6 +173,11 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
     // hidden state.
     virtual bool IsHidden() = 0;
 
+    // Returns the FTN id of the parent delegate (WebContents) that is hosting

[Charlie Reis, 2015/04/30 23:06:46]

s/parent/embedder/

[lazyboy, 2015/05/05 07:28:14]

Done for now.
Although it was suggested by nasko to use parent/child terminology
in content/ instead of embedder/guest.

+    // this delegate (WebContents), -1 if this WebContents does not have a

[Charlie Reis, 2015/04/30 23:06:46]

Period.  Then "Returns -1 if"

[lazyboy, 2015/05/05 07:28:14]

Done.

+    // parent delegate.

[Charlie Reis, 2015/04/30 23:06:46]

s/parent/embedder/

[lazyboy, 2015/05/05 07:28:14]

Done.

+    virtual int64 GetEmbedderFrameTreeNodeID() = 0;
+
    protected:
     virtual ~Delegate() {}
   };
@@ -219,6 +224,7 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
   RenderWidgetHostView* GetRenderWidgetHostView() const;
 
   RenderFrameProxyHost* GetProxyToParent();
+  RenderFrameProxyHost* GetProxyToEmbedder();
 
   // Returns the pending RenderFrameHost, or NULL if there is no pending one.
   RenderFrameHostImpl* pending_frame_host() const {
@@ -421,6 +427,19 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
                                    RenderViewHostImpl* render_view_host,
                                    SiteInstance* instance);
 
+  // Creates a proxy for guest frame in embedder's process.

[Charlie Reis, 2015/04/30 23:06:46]

Called on the guest RFHM to create a proxy for this guest frame in its
embedder's process.

[lazyboy, 2015/05/05 07:28:13]

Done.

+  // This proxy is used to swap out the initial guest frame in embedder.

[Charlie Reis, 2015/04/30 23:06:46]

in the embedder.

[lazyboy, 2015/05/05 07:28:14]

Done.

+  void CreateEmbedderProxy(SiteInstance* embedder_site_instance,
+                           int* swapped_out_render_view_routing_id,
+                           int* proxy_routing_id);
+
+  // Replaces initial guest frame in embedder with the proxy that has routing

[Charlie Reis, 2015/04/30 23:06:46]

Called on the embedder RFHM to replace the initial guest frame in the embedder
with...

[lazyboy, 2015/05/05 07:28:14]

Done.

+  // id |proxy_to_embedder_routing_id|.
+  void ReplaceWithGuestProxy(int proxy_to_embedder_routing_id);
+
+  // Sets the child RWHV for this guest frame.
+  void UpdateGuestRWHView(RenderWidgetHostView* child_rwhv);

[Charlie Reis, 2015/04/30 23:06:46]

SetGuestRenderWidgetHostView

[lazyboy, 2015/05/05 07:28:14]

Done.

+
  private:
   friend class FrameTreeVisualizer;
   friend class NavigatorTestWithBrowserSideNavigation;