Adding RenderWidgetHostViewChildFrame for OOPIF view.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_frame_host.h"
 
 class GURL;
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 
+class CrossProcessFrameConnector;
 class FrameTree;
 class FrameTreeNode;
 class RenderFrameHostDelegate;
 class RenderProcessHost;
 class RenderViewHostImpl;
 
 class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
  public:
   static RenderFrameHostImpl* FromID(int process_id, int routing_id);
 
@@ skipping 12 matching lines @@
   void Init();
   int routing_id() const { return routing_id_; }
   void OnCreateChildFrame(int new_frame_routing_id,
                           int64 parent_frame_id,
                           int64 frame_id,
                           const std::string& frame_name);
 
   RenderViewHostImpl* render_view_host() { return render_view_host_; }
   RenderFrameHostDelegate* delegate() { return delegate_; }
 
+  // This function is called when this is a swapped out RenderFrameHost that

[Charlie Reis, 2013/12/20 00:24:22]

"when this is a swapped out RenderFrameHost:" That's a temporary state.  Does
this need to be called with NULL if this RenderFrameHost becomes active again?

+  // lives in the same process as the parent frame. The
+  // |cross_process_frame_connector| allows the non-swapped-out

[Charlie Reis, 2013/12/20 00:24:22]

nit: non-swapped-out -> active

+  // RenderFrameHost for a frame to communicate with the parent process
+  // so that it may composite drawing data.
+  //
+  // Ownership is not transfered.
+  void set_cross_process_frame_connector(
+      CrossProcessFrameConnector* cross_process_frame_connector) {
+    cross_process_frame_connector_ = cross_process_frame_connector;
+  }
+
  protected:
   friend class RenderFrameHostFactory;
 
   // TODO(nasko): Remove dependency on RenderViewHost here. RenderProcessHost
   // should be the abstraction needed here, but we need RenderViewHost to pass
   // into WebContentsObserver::FrameDetached for now.
   RenderFrameHostImpl(RenderViewHostImpl* render_view_host,
                       RenderFrameHostDelegate* delegate,
                       FrameTree* frame_tree,
                       FrameTreeNode* frame_tree_node,
@@ skipping 15 matching lines @@
   // For now, RenderFrameHosts indirectly keep RenderViewHosts alive via a
   // refcount that calls Shutdown when it reaches zero.  This allows each
   // RenderFrameHostManager to just care about RenderFrameHosts, while ensuring
   // we have a RenderViewHost for each RenderFrameHost.
   // TODO(creis): RenderViewHost will eventually go away and be replaced with
   // some form of page context.
   RenderViewHostImpl* render_view_host_;
 
   RenderFrameHostDelegate* delegate_;
 
+  // |cross_process_frame_connector_| passes messages from an out-of-process
+  // child frame to the parent process for compositing.
+  //
+  // This is only non-NULL when this is the swapped out RenderFrameHost in
+  // the same site instance as this frame's parent.

[Charlie Reis, 2013/12/20 00:24:22]

nit: SiteInstance

+  //
+  // See the class comment above CrossProcessFrameConnector for more
+  // information.
+  //
+  // This will move to RenderFrameProxyHost when that class is created.
+  CrossProcessFrameConnector* cross_process_frame_connector_;
+
   // Reference to the whole frame tree that this RenderFrameHost belongs too.
   // Allows this RenderFrameHost to add and remove nodes in response to
   // messages from the renderer requesting DOM manipulation.
   FrameTree* frame_tree_;
 
   // The FrameTreeNode which this RenderFrameHostImpl is hosted in.
   FrameTreeNode* frame_tree_node_;
 
   int routing_id_;
   bool is_swapped_out_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_