Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/browser_compositor_output_surface.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_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/threading/non_thread_safe.h"
 #include "cc/output/output_surface.h"
 #include "content/common/content_export.h"
@@ skipping 21 matching lines @@
 
   // ui::CompositorOutputSurface::Observer implementation.
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval) override;
 
   void OnUpdateVSyncParametersFromGpu(base::TimeTicks tiembase,
                                       base::TimeDelta interval);
 
   void SetReflector(ReflectorImpl* reflector);
 
+  // Called when |reflector_| was updated.
+  virtual void OnReflectorChanged();
+
+  // Returns a callback that will be called when all mirroring
+  // compositors have started composition.
+  virtual base::Closure CreateCompositionStartedCallback();
+
 #if defined(OS_MACOSX)
   virtual void OnSurfaceDisplayed() = 0;
   virtual void SetSurfaceSuspendedForRecycle(bool suspended) = 0;
   virtual bool SurfaceShouldNotShowFramesAfterSuspendForRecycle() const = 0;
 #endif
 
  protected:
   // Constructor used by the accelerated implementation.
   BrowserCompositorOutputSurface(
       const scoped_refptr<cc::ContextProvider>& context,
@@ skipping 14 matching lines @@
 
   scoped_ptr<BrowserCompositorOverlayCandidateValidator>
       overlay_candidate_validator_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_