Use shared D3D9 texture to transport the compositor's backing buffer to the browser...

ui/gfx/gl/gl_surface.h

Index: ui/gfx/gl/gl_surface.h
===================================================================
--- ui/gfx/gl/gl_surface.h	(revision 106500)
+++ ui/gfx/gl/gl_surface.h	(working copy)
@@ -31,6 +31,8 @@
   // Destroys the surface.
   virtual void Destroy() = 0;
 
+  virtual bool Resize(const gfx::Size& size);
+
   // Returns true if this surface is offscreen.
   virtual bool IsOffscreen() = 0;
 
@@ -54,8 +56,24 @@
   // on error.
   virtual bool OnMakeCurrent(GLContext* context);
 
+  // This gives a hint as to whether this surface is visible. If it is not
+  // visible, the backing store need not be preserved.
   virtual void SetVisible(bool visible);
 
+  // Get a handle used to share the surface with another process. Returns null
+  // if this is not possible.
+  virtual void* GetShareHandle();
+
+  // Get the platform specific display on which this surface resides, if
+  // available.
+  virtual void* GetDisplay();
+
+  // Get the platfrom specific configuration for this surface, if available.
+  virtual void* GetConfig();
+
+  // Get the GL pixel format of the surface, if available.
+  virtual unsigned GetFormat();
+
   // Create a GL surface that renders directly to a view.
   static scoped_refptr<GLSurface> CreateViewGLSurface(
       bool software,
@@ -78,6 +96,34 @@
   DISALLOW_COPY_AND_ASSIGN(GLSurface);
 };
 
+// Implementation of GLSurface that forwards all calls through to another
+// GLSurface.
+class GL_EXPORT GLSurfaceAdapter : public GLSurface {
+ public:
+  explicit GLSurfaceAdapter(GLSurface* surface);
+  virtual ~GLSurfaceAdapter();
+
+  virtual bool Initialize();
+  virtual void Destroy();
+  virtual bool Resize(const gfx::Size& size);
+  virtual bool IsOffscreen();
+  virtual bool SwapBuffers();
+  virtual gfx::Size GetSize();
+  virtual void* GetHandle();
+  virtual unsigned int GetBackingFrameBufferObject();
+  virtual bool OnMakeCurrent(GLContext* context);
+  virtual void* GetShareHandle();
+  virtual void* GetDisplay();
+  virtual void* GetConfig();
+  virtual unsigned GetFormat();
+
+  GLSurface* surface() const { return surface_.get(); }
+
+ private:
+  scoped_refptr<GLSurface> surface_;
+  DISALLOW_COPY_AND_ASSIGN(GLSurfaceAdapter);
+};
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_H_