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

content/browser/compositor/gpu_browser_compositor_output_surface.h

Index: content/browser/compositor/gpu_browser_compositor_output_surface.h
diff --git a/content/browser/compositor/gpu_browser_compositor_output_surface.h b/content/browser/compositor/gpu_browser_compositor_output_surface.h
index 2b3d2b76dbf68bbaecd5767c93d488f7431f09cc..d91bcda3a7b952a0364dede51e2f0538714f6232 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.h
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.h
@@ -15,6 +15,8 @@ class CompositorVSyncManager;
 namespace content {
 class CommandBufferProxyImpl;
 class BrowserCompositorOverlayCandidateValidator;
+class GLHelper;
+class OwnedMailbox;
 
 // Adapts a WebGraphicsContext3DCommandBufferImpl into a
 // cc::OutputSurface that also handles vsync parameter updates
@@ -31,10 +33,15 @@ class GpuBrowserCompositorOutputSurface
   ~GpuBrowserCompositorOutputSurface() override;
 
  protected:
+  // BrowserCompositorOutputSurface:
+  void OnReflectorChanged() override;
+
   // cc::OutputSurface implementation.
   void SwapBuffers(cc::CompositorFrame* frame) override;
   bool BindToClient(cc::OutputSurfaceClient* client) override;
 
+  void DeleteTexture();
+
 #if defined(OS_MACOSX)
   void OnSurfaceDisplayed() override;
   void SetSurfaceSuspendedForRecycle(bool suspended) override;
@@ -62,6 +69,11 @@ class GpuBrowserCompositorOutputSurface
                                 base::TimeDelta interval)>
       update_vsync_parameters_callback_;
 
+  // Texture for mirroring.
+  scoped_refptr<OwnedMailbox> mailbox_;
+  scoped_ptr<GLHelper> mirrored_compositor_gl_helper_;
+  int mirrored_compositor_gl_helper_texture_id_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuBrowserCompositorOutputSurface);
 };