gpu: Add CHROMIUM_copy_image extension.

ui/gl/gl_image_egl.cc

 // Copyright (c) 2013 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.
 
 #include "ui/gl/gl_image_egl.h"
 
 #include "ui/gl/egl_util.h"
 #include "ui/gl/gl_fence.h"
 #include "ui/gl/gl_surface_egl.h"
 
@@ skipping 60 matching lines @@
 bool GLImageEGL::CopyTexImage(unsigned target) {
   return false;
 }
 
 bool GLImageEGL::CopyTexSubImage(unsigned target,
                                  const gfx::Point& offset,
                                  const gfx::Rect& rect) {
   return false;
 }
 
+bool GLImageEGL::CopySubImageData(unsigned texture_id,
+                                  const gfx::Point& offset,
+                                  const gfx::Rect& rect,
+                                  GLFence* in_fence,
+                                  GLFence* out_fence) {
+  return false;
+}
+
 bool GLImageEGL::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                       int z_order,
                                       gfx::OverlayTransform transform,
                                       const gfx::Rect& bounds_rect,
                                       const gfx::RectF& crop_rect) {
   return false;
 }
 
 }  // namespace gl