gpu: Add CHROMIUM_copy_image extension.

ui/gl/gl_image.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_IMAGE_H_
 #define UI_GL_GL_IMAGE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 44 matching lines @@
   // return false.
   virtual bool CopyTexImage(unsigned target) = 0;
 
   // Copy |rect| of image to |offset| in texture currently bound to |target|.
   // Returns true on success. It is valid for an implementation to always
   // return false.
   virtual bool CopyTexSubImage(unsigned target,
                                const gfx::Point& offset,
                                const gfx::Rect& rect) = 0;
 
+  // Copy |rect| of image to |offset| in texture with |texture_id|.
+  // Returns true on success. Unlike above functions, this doesn't require
+  // the destination texture to be bound to a target and fences provide more
+  // efficient synchronization.
+  virtual bool CopySubImageData(unsigned texture_id,
+                                const gfx::Point& offset,
+                                const gfx::Rect& rect,
+                                GLFence* in_fence,
+                                GLFence* out_fence) = 0;
+
   // Schedule image as an overlay plane to be shown at swap time for |widget|.
   virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                     int z_order,
                                     gfx::OverlayTransform transform,
                                     const gfx::Rect& bounds_rect,
                                     const gfx::RectF& crop_rect) = 0;
 
   // Flush any preceding rendering for the image.
   virtual void Flush() = 0;
 
@@ skipping 26 matching lines @@
 
  private:
   friend class base::RefCounted<GLImage>;
 
   DISALLOW_COPY_AND_ASSIGN(GLImage);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_IMAGE_H_