gpu: Add CHROMIUM_copy_image extension.

gpu/command_buffer/tests/texture_image_factory.cc

Index: gpu/command_buffer/tests/texture_image_factory.cc
diff --git a/gpu/command_buffer/tests/texture_image_factory.cc b/gpu/command_buffer/tests/texture_image_factory.cc
index 6db8d8ee49aa06ad7b15f6bcd45b345bedebb685..6f00bc648fd65d21b8c84eaf0f37cc51f65790f7 100644
--- a/gpu/command_buffer/tests/texture_image_factory.cc
+++ b/gpu/command_buffer/tests/texture_image_factory.cc
@@ -32,6 +32,13 @@ class TextureImage : public gl::GLImage {
                        const gfx::Rect& rect) override {
     return false;
   }
+  bool CopySubImageData(unsigned texture_id,
+                        const gfx::Point& offset,
+                        const gfx::Rect& rect,
+                        gl::GLFence* in_fence,
+                        gl::GLFence* out_fence) override {
+    return false;
+  }
 
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int z_order,