gpu: Add CHROMIUM_copy_image extension.

gpu/command_buffer/service/texture_definition.cc

Index: gpu/command_buffer/service/texture_definition.cc
diff --git a/gpu/command_buffer/service/texture_definition.cc b/gpu/command_buffer/service/texture_definition.cc
index da06b28318e4d2213bd48b252161aa26df575707..c662dda2b874ec43aef8c38a6a32adbdd2fa18a2 100644
--- a/gpu/command_buffer/service/texture_definition.cc
+++ b/gpu/command_buffer/service/texture_definition.cc
@@ -44,6 +44,11 @@ class GLImageSync : public gl::GLImage {
   bool CopyTexSubImage(unsigned target,
                        const gfx::Point& offset,
                        const gfx::Rect& rect) override;
+  bool CopySubImageData(unsigned texture_id,
+                        const gfx::Point& offset,
+                        const gfx::Rect& rect,
+                        gl::GLFence* in_fence,
+                        gl::GLFence* out_fence) override;
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int z_order,
                             gfx::OverlayTransform transform,
@@ -106,6 +111,14 @@ bool GLImageSync::CopyTexSubImage(unsigned target,
   return false;
 }
 
+bool GLImageSync::CopySubImageData(unsigned texture_id,
+                                   const gfx::Point& offset,
+                                   const gfx::Rect& rect,
+                                   gl::GLFence* in_fence,
+                                   gl::GLFence* out_fence) {
+  return false;
+}
+
 bool GLImageSync::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                        int z_order,
                                        gfx::OverlayTransform transform,