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 9b28575a1ab9c3930ec268cdd26f6c9d39319237..015746071c0da8de302025c8b6af2d939fdd4191 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -177,6 +177,14 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
     // hidden state.
     virtual bool IsHidden() = 0;
 
+    // Returns the FrameTreeNode id of the outer WebContents that is hosting
+    // this (inner) WebContents.

[nasko, 2015/06/15 23:00:13]

nit: Lots of empty whitespace at end of this line. Start the next line of
comment at the end of this sentence.

[lazyboy, 2015/06/16 17:59:51]

Done.

+    // This FrameTreeNode is the frame that represents this inner WebContents
+    // within the outer WebContents.

[nasko, 2015/06/15 23:00:13]

nit: s/within/within the FrameTree of/

[lazyboy, 2015/06/16 17:59:51]

Done.

+    // Returns FrameTreeNode::FRAME_TREE_NODE_ID_NONE if this WebContents does
+    // not have an outer WebContents.
+    virtual int GetOuterDelegateFrameTreeNodeID() = 0;
+
    protected:
     virtual ~Delegate() {}
   };
@@ -222,7 +230,25 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
   // there is no current one.
   RenderWidgetHostView* GetRenderWidgetHostView() const;
 
+  // Returns the RenderWidgetHost of outer WebContents that can be used to fetch
+  // the last keyboard event.
+  // TODO(lazyboy): This can be removed once input events are sent directly to
+  // remote frames.
+  RenderWidgetHostImpl* GetOuterRenderWidgetHostForKeyboardInput();
+
   RenderFrameProxyHost* GetProxyToParent();
+  RenderFrameProxyHost* GetProxyToOuterDelegate();

[nasko, 2015/06/15 23:00:13]

nit: Add a small comment to describe what this method does. It should address
the fact that it can return nullptr if there is no inner/outer relationship.

[lazyboy, 2015/06/16 17:59:51]

Done.

+
+  // Returns whether this manager belongs to a FrameTreeNode that is a main
+  // frame in an inner WebContents.
+  //

[nasko, 2015/06/15 23:00:13]

nit: no need for empty line.

[lazyboy, 2015/06/16 17:59:51]

Done.

+  // TODO(lazyboy): Make this work correctly for subframes inside inner
+  // WebContents too.
+  bool ForInnerDelegate();
+
+  // Removes the FrameTreeNode in the outer WebContents that represents this
+  // FrameTreeNode.
+  void RemoveOuterDelegateFrame();
 
   // Returns the pending RenderFrameHost, or NULL if there is no pending one.
   RenderFrameHostImpl* pending_frame_host() const {
@@ -422,6 +448,15 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
                                    RenderViewHostImpl* render_view_host,
                                    SiteInstance* instance);
 
+  // Called on the RFHM of the inner WebContents to create a proxy for this

[nasko, 2015/06/15 23:00:13]

nit: s/proxy/RenderFrameProxyHost/

[lazyboy, 2015/06/16 17:59:51]

Done.

+  // inner WebContents's frame in its outer WebContents's process.

[nasko, 2015/06/15 23:00:13]

nit: s/process/SiteInstance/. Also, the SiteInstance for the parent frame, not
just any frame in the outer WebContents.

[lazyboy, 2015/06/16 17:59:51]

Done.

+  void CreateOuterDelegateProxy(SiteInstance* outer_contents_site_instance,
+                                RenderFrameHostImpl* render_frame_host);
+
+  // Sets the child RWHV for this frame, which much be part of an inner

[nasko, 2015/06/15 23:00:13]

nit: s/RWHV/RenderWidgetHostView/

[lazyboy, 2015/06/16 17:59:51]

Done.

+  // WebContents.
+  void SetRWHViewForInnerContents(RenderWidgetHostView* child_rwhv);
+
  private:
   friend class FrameTreeVisualizer;
   friend class NavigatorTestWithBrowserSideNavigation;