Allow out-of-process iframes to render to compositing surfaces.

content/browser/frame_host/cross_process_frame_connector.h

 // Copyright 2014 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_CROSS_PROCESS_FRAME_CONNECTOR_H_
 #define CONTENT_BROWSER_FRAME_HOST_CROSS_PROCESS_FRAME_CONNECTOR_H_
 
 #include "cc/output/compositor_frame.h"
+#include "content/common/content_export.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace blink {
 class WebInputEvent;
 }
 
+namespace cc {
+struct SurfaceId;
+struct SurfaceSequence;
+}
+
 namespace IPC {
 class Message;
 }
 
 struct FrameHostMsg_CompositorFrameSwappedACK_Params;
 struct FrameHostMsg_ReclaimCompositorResources_Params;
 
 namespace content {
 class RenderFrameProxyHost;
 class RenderWidgetHostImpl;
@@ skipping 28 matching lines @@
 // CrossProcessFrameConnector bridges between B2's
 // RenderWidgetHostViewChildFrame and A2 to allow for this communication.
 // (Note: B1 is only mentioned for completeness. It is not needed in this
 // example.)
 //
 // CrossProcessFrameConnector objects are owned by the RenderFrameProxyHost
 // in the child frame's RenderFrameHostManager corresponding to the parent's
 // SiteInstance, A2 in the picture above. When a child frame navigates in a new
 // process, set_view() is called to update to the new view.
 //
-class CrossProcessFrameConnector {
+class CONTENT_EXPORT CrossProcessFrameConnector {
  public:
   // |frame_proxy_in_parent_renderer| corresponds to A2 in the example above.
   explicit CrossProcessFrameConnector(
       RenderFrameProxyHost* frame_proxy_in_parent_renderer);
   virtual ~CrossProcessFrameConnector();
 
   bool OnMessageReceived(const IPC::Message &msg);
 
   // |view| corresponds to B2's RenderWidgetHostViewChildFrame in the example
   // above.
   void set_view(RenderWidgetHostViewChildFrame* view);
   RenderWidgetHostViewChildFrame* get_view_for_testing() { return view_; }
 
   void RenderProcessGone();
 
-  void ChildFrameCompositorFrameSwapped(uint32 output_surface_id,
-                                        int host_id,
-                                        int route_id,
-                                        scoped_ptr<cc::CompositorFrame> frame);
+  virtual void ChildFrameCompositorFrameSwapped(
+      uint32 output_surface_id,
+      int host_id,
+      int route_id,
+      scoped_ptr<cc::CompositorFrame> frame);
+  virtual void SetChildFrameSurface(cc::SurfaceId& surface_id,

[dcheng, 2015/05/28 22:16:30]

No mutable references in arguments in Chrome.

[kenrb, 2015/05/29 19:29:36]

Done.

+                                    gfx::Size frame_size,

[dcheng, 2015/05/28 22:16:30]

This should probably be const gfx::Size&.

[kenrb, 2015/05/29 19:29:36]

Done.

+                                    float scale_factor,
+                                    cc::SurfaceSequence& sequence);
 
   gfx::Rect ChildFrameRect();
 
  private:
   // Handlers for messages received from the parent frame.
   void OnCompositorFrameSwappedACK(
       const FrameHostMsg_CompositorFrameSwappedACK_Params& params);
   void OnReclaimCompositorResources(
       const FrameHostMsg_ReclaimCompositorResources_Params& params);
   void OnForwardInputEvent(const blink::WebInputEvent* event);
   void OnInitializeChildFrame(gfx::Rect frame_rect, float scale_factor);
+  void OnSatisfySequence(const cc::SurfaceSequence& sequence);
+  void OnRequireSequence(const cc::SurfaceId& id,
+                         const cc::SurfaceSequence& sequence);
 
   void SetDeviceScaleFactor(float scale_factor);
   void SetSize(gfx::Rect frame_rect);
 
   // The RenderFrameProxyHost that routes messages to the parent frame's
   // renderer process.
   RenderFrameProxyHost* frame_proxy_in_parent_renderer_;
 
   // The RenderWidgetHostView for the frame. Initially NULL.
   RenderWidgetHostViewChildFrame* view_;
 
   gfx::Rect child_frame_rect_;
   float device_scale_factor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_CROSS_PROCESS_FRAME_CONNECTOR_H_