Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/command_buffer/service/image_factory.h

Index: gpu/command_buffer/service/image_factory.h
diff --git a/gpu/command_buffer/service/image_factory.h b/gpu/command_buffer/service/image_factory.h
index cfa4cef27f0f6195c7608edbba5f1b0f1ad99348..1db88cc8ed7cb076aa6801a9b656d477668f57b1 100644
--- a/gpu/command_buffer/service/image_factory.h
+++ b/gpu/command_buffer/service/image_factory.h
@@ -30,6 +30,19 @@ class GPU_EXPORT ImageFactory {
       unsigned internalformat,
       int client_id) = 0;
 
+  // Create an anonymous GLImage backed by a GpuMemoryBuffer that doesn't have a
+  // client_id. It can't be passed to other processes.
+  virtual scoped_refptr<gl::GLImage> CreateAnonymousImage(
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      unsigned internalformat);
+
+  // An image can only be bound to a texture with the appropriate type.
+  virtual unsigned RequiredTextureType();
+
+  // Whether a created image can have format GL_RGB.
+  virtual bool SupportsFormatRGB();
+
  protected:
   virtual ~ImageFactory();
 };