Have a common implementation of cc::OutputSurface

cc/output_surface.h

 // Copyright 2012 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 CC_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_SURFACE_H_
 
 #define USE_CC_OUTPUT_SURFACE // TODO(danakj): Remove this.
 
+#include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
+#include "cc/software_output_device.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputSurface.h"
-
-namespace WebKit {
-class WebGraphicsContext3D;
-}
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 
 namespace cc {
 
 class CompositorFrame;
 class OutputSurfaceClient;
-class SoftwareOutputDevice;
 
 // Represents the output surface for a compositor. The compositor owns
 // and manages its destruction. Its lifetime is:
 //   1. Created on the main thread by the LayerTreeHost through its client.
 //   2. Passed to the compositor thread and bound to a client via BindToClient.
 //      From here on, it will only be used on the compositor thread.
 //   3. If the 3D context is lost, then the compositor will delete the output
 //      surface (on the compositor thread) and go back to step 1.
 class CC_EXPORT OutputSurface : public WebKit::WebCompositorOutputSurface {
  public:
-  virtual ~OutputSurface() {}
+  OutputSurface(scoped_ptr<WebKit::WebGraphicsContext3D> context3d);
 
-  // Called by the compositor on the compositor thread. This is a place where
-  // thread-specific data for the output surface can be initialized, since from
-  // this point on the output surface will only be used on the compositor
-  // thread.
-  virtual bool BindToClient(OutputSurfaceClient*) = 0;
+  OutputSurface(scoped_ptr<cc::SoftwareOutputDevice> software_device);
+
+  OutputSurface(scoped_ptr<WebKit::WebGraphicsContext3D> context3d,
+                scoped_ptr<cc::SoftwareOutputDevice> software_device);
+
+  virtual ~OutputSurface();
 
   struct Capabilities {
     Capabilities()
         : has_parent_compositor(false) {}
 
     bool has_parent_compositor;
   };
 
-  virtual const Capabilities& Capabilities() const = 0;
+  const Capabilities& capabilities() const {
+    return capabilities_;
+  }
 
   // Obtain the 3d context or the software device associated with this output
   // surface. Either of these may return a null pointer, but not both.
   // In the event of a lost context, the entire output surface should be
   // recreated.
-  virtual WebKit::WebGraphicsContext3D* Context3D() const = 0;
-  virtual SoftwareOutputDevice* SoftwareDevice() const = 0;
+  WebKit::WebGraphicsContext3D* context3d() const {
+    return context3d_.get();
+  }
+
+  SoftwareOutputDevice* software_device() const {
+    return software_device_.get();
+  }
+
+  // Called by the compositor on the compositor thread. This is a place where
+  // thread-specific data for the output surface can be initialized, since from
+  // this point on the output surface will only be used on the compositor
+  // thread.
+  virtual bool BindToClient(OutputSurfaceClient*);
 
   // Sends frame data to the parent compositor. This should only be called when
   // capabilities().has_parent_compositor. The implementation may destroy or
   // steal the contents of the CompositorFrame passed in.
-  virtual void SendFrameToParentCompositor(CompositorFrame*) = 0;
+  virtual void SendFrameToParentCompositor(CompositorFrame*);
 
   // Notifies frame-rate smoothness preference. If true, all non-critical
   // processing should be stopped, or lowered in priority.
   virtual void UpdateSmoothnessTakesPriority(bool prefer_smoothness) {}
+
+ protected:
+  OutputSurfaceClient* client_;
+  struct cc::OutputSurface::Capabilities capabilities_;
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d_;
+  scoped_ptr<cc::SoftwareOutputDevice> software_device_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SURFACE_H_