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

content/renderer/child_frame_compositing_helper.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_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 #define CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace base {
 class SharedMemory;
 }
 
 namespace cc {
+struct SurfaceId;
+struct SurfaceSequence;
+
 class CompositorFrame;
 class Layer;
 class SolidColorLayer;
+class SurfaceLayer;
 class DelegatedFrameProvider;
 class DelegatedFrameResourceCollection;
 class DelegatedRendererLayer;
 }
 
 namespace blink {
 class WebFrame;
 class WebPluginContainer;
 class WebLayer;
 }
@@ skipping 23 matching lines @@
       RenderFrameProxy* render_frame_proxy);
 
   void DidCommitCompositorFrame();
   void EnableCompositing(bool);
   void OnContainerDestroy();
   void OnCompositorFrameSwapped(scoped_ptr<cc::CompositorFrame> frame,
                                 int route_id,
                                 uint32 output_surface_id,
                                 int host_id,
                                 base::SharedMemoryHandle handle);
+  void OnSetSurface(const cc::SurfaceId& surface_id,
+                    const gfx::Size& frame_size,
+                    float scale_factor,
+                    const cc::SurfaceSequence& sequence);
   void UpdateVisibility(bool);
   void ChildFrameGone();
 
   // cc::DelegatedFrameProviderClient implementation.
   void UnusedResourcesAreAvailable() override;
   void SetContentsOpaque(bool);
 
  protected:
   // Friend RefCounted so that the dtor can be non-public.
   friend class base::RefCounted<ChildFrameCompositingHelper>;
@@ skipping 12 matching lines @@
   int GetInstanceID();
 
   void SendCompositorFrameSwappedACKToBrowser(
       FrameHostMsg_CompositorFrameSwappedACK_Params& params);
   void SendReclaimCompositorResourcesToBrowser(
       FrameHostMsg_ReclaimCompositorResources_Params& params);
   void CheckSizeAndAdjustLayerProperties(const gfx::Size& new_size,
                                          float device_scale_factor,
                                          cc::Layer* layer);
   void SendReturnedDelegatedResources();
+  static void SatisfyCallback(ChildFrameCompositingHelper* helper,
+                              cc::SurfaceSequence sequence);

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

Is there a convention for whether this is passed by value or reference?

[kenrb, 2015/05/29 19:29:37]

It has to match the base::Callback definitions in surface_layer.h.

+  static void RequireCallback(ChildFrameCompositingHelper* helper,
+                              cc::SurfaceId id,
+                              cc::SurfaceSequence sequence);
 
   int host_routing_id_;
   int last_route_id_;
   uint32 last_output_surface_id_;
   int last_host_id_;
   bool ack_pending_;
   bool opaque_;
 
   gfx::Size buffer_size_;
 
   // The lifetime of this weak pointer should be greater than the lifetime of
   // other member objects, as they may access this pointer during their
   // destruction.
   base::WeakPtr<BrowserPlugin> browser_plugin_;
   RenderFrameProxy* render_frame_proxy_;
 
   scoped_refptr<cc::DelegatedFrameResourceCollection> resource_collection_;
   scoped_refptr<cc::DelegatedFrameProvider> frame_provider_;
 
+  // For cc::Surface support.
+  scoped_refptr<cc::SurfaceLayer> surface_layer_;
+
   scoped_refptr<cc::SolidColorLayer> background_layer_;
   scoped_refptr<cc::DelegatedRendererLayer> delegated_layer_;
   scoped_ptr<blink::WebLayer> web_layer_;
   blink::WebFrame* frame_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildFrameCompositingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_