Add FBO support in Android WebView

ui/gl/gl_surface_stub.h

 // Copyright (c) 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 UI_GL_GL_SURFACE_STUB_H_
 #define UI_GL_GL_SURFACE_STUB_H_
 
 #include "ui/gl/gl_surface.h"
 
 namespace gfx {
 
 // A GLSurface that does nothing for unit tests.
 class GL_EXPORT GLSurfaceStub : public GLSurface {
  public:
+  GLSurfaceStub();
+
   void SetSize(const gfx::Size& size) { size_ = size; }
+  void UpdateFBO();

[joth, 2013/08/04 00:45:16]

may need a comment, or more verbose name
UpdateFboFromContext()
UpdateFrameBufferObjectFromContext()

[boliu, 2013/08/05 16:58:24]

Changed to SaveCurrentFBO. The FromContext bit is confusing so didn't add it.

 
   // Implement GLSurface.
   virtual void Destroy() OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
+  virtual unsigned int GetBackingFrameBufferObject();
   virtual bool SwapBuffers() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void* GetHandle() OVERRIDE;
 
  protected:
   virtual ~GLSurfaceStub();
 
  private:
+  unsigned int fbo_;
   gfx::Size size_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_STUB_H_