gpu: Add CHROMIUM_copy_image extension.

gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
index f56db239f712dcd1489bb33372442bce6dda3ca7..1ea9a7563901caa742814f93f497d721538958cb 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc
@@ -3803,6 +3803,12 @@ class MockGLImage : public gl::GLImage {
   MOCK_METHOD1(CopyTexImage, bool(unsigned));
   MOCK_METHOD3(CopyTexSubImage,
                bool(unsigned, const gfx::Point&, const gfx::Rect&));
+  MOCK_METHOD5(CopySubImageData,
+               bool(unsigned,
+                    const gfx::Point&,
+                    const gfx::Rect&,
+                    gl::GLFence*,
+                    gl::GLFence*));
   MOCK_METHOD5(ScheduleOverlayPlane, bool(gfx::AcceleratedWidget,
                                           int,
                                           gfx::OverlayTransform,