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 15338be2d0de70f6d680a0daf3b0359aa460b58d..d861bd276eb1afa2f603cbbee8a2321eef9dfc7b 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -216,6 +216,7 @@ 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 {
@@ -241,6 +242,10 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
     return should_reuse_web_ui_ ? web_ui_.get() : speculative_web_ui_.get();
   }
 
+  void set_pseudo_parent_frame_tree_node_id(int64 parent_frame_tree_node_id) {
+    pseudo_parent_frame_tree_node_id_ = parent_frame_tree_node_id;
+  }
+
   // Called when we want to instruct the renderer to navigate to the given
   // navigation entry. It may create a new RenderFrameHost or re-use an existing
   // one. The RenderFrameHost to navigate will be returned. Returns NULL if one
@@ -616,6 +621,8 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
   RenderViewHostDelegate* render_view_delegate_;
   RenderWidgetHostDelegate* render_widget_delegate_;
 
+  int64 pseudo_parent_frame_tree_node_id_;

[Charlie Reis, 2015/03/10 04:09:44]

Pseudo is not very descriptive.  Do you mean embedder?

(I think it's worth documenting these things now to help us read the CL and
understand it.)

+
   // Our RenderFrameHost and its associated Web UI (if any, will be NULL for
   // non-WebUI pages). This object is responsible for all communication with
   // a child RenderFrame instance.