gpu: Refactor GpuMemoryBuffer framework for multi-process support.

ui/gl/gl_image_shm.h

Index: ui/gl/gl_image_shm.h
diff --git a/ui/gl/gl_image_shm.h b/ui/gl/gl_image_shm.h
index 8797ecb598aaefdf2a493b092ab989f1bcbab48b..88d95dbf61d56d99adf9c0041ef301ff42bbf0c5 100644
--- a/ui/gl/gl_image_shm.h
+++ b/ui/gl/gl_image_shm.h
@@ -12,7 +12,7 @@ namespace gfx {
 
 class GL_EXPORT GLImageShm : public GLImage {
  public:
-  explicit GLImageShm(gfx::Size size);
+  GLImageShm(const gfx::Size& size, unsigned internalformat);
 
   bool Initialize(gfx::GpuMemoryBufferHandle buffer);
 
@@ -28,6 +28,7 @@ class GL_EXPORT GLImageShm : public GLImage {
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
   gfx::Size size_;
+  unsigned internalformat_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageShm);
 };