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 086dea52b11022fb353ca0ca1f209cf81297cb70..3fe3da40c6577590227692dbd9a87a93549c185a 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -174,6 +174,11 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
     // hidden state.
     virtual bool IsHidden() = 0;
 
+    // Returns the FTN id of the embedder delegate (WebContents) that is hosting
+    // this delegate (WebContents). Returns  -1 if this WebContents does not
+    // have embedder delegate.
+    virtual int64 GetEmbedderFrameTreeNodeID() = 0;
+
    protected:
     virtual ~Delegate() {}
   };
@@ -220,6 +225,10 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
   RenderWidgetHostView* GetRenderWidgetHostView() const;
 
   RenderFrameProxyHost* GetProxyToParent();
+  RenderFrameProxyHost* GetProxyToEmbedder();
+
+  // Returns whether this manager belongs to a FTN that is a guest main frame.
+  bool IsGuest();

[nasko, 2015/05/05 21:34:50]

nit: I would prefer if we can come up with a more generic terminology than
Embedder/Guest, as we are going for more generic method of linking WebContents
to each other.

I noticed that Charlie went the other direction, so let's sync on that the next
time we have a meeting.

[lazyboy, 2015/05/05 22:33:53]

Acknowledged.

 
   // Returns the pending RenderFrameHost, or NULL if there is no pending one.
   RenderFrameHostImpl* pending_frame_host() const {
@@ -426,6 +435,19 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
                                    RenderViewHostImpl* render_view_host,
                                    SiteInstance* instance);
 
+  // Called on the guest RFHM to create a proxy for this guest frame in its
+  // embedder process.
+  // Returns the proxy routing ID.
+  int CreateEmbedderProxy(SiteInstance* embedder_site_instance);
+
+  // Called on the embedder RFHM to replace the initial guest frame in the
+  // embedder with the proxy that has routing id
+  // |proxy_to_embedder_routing_id|.
+  void ReplaceWithGuestProxy(int proxy_to_embedder_routing_id);
+
+  // Sets the child RWHV for this guest frame.
+  void SetGuestRWHView(RenderWidgetHostView* child_rwhv);
+
  private:
   friend class FrameTreeVisualizer;
   friend class NavigatorTestWithBrowserSideNavigation;