Allow requesting a copy of a surface.

cc/surfaces/surface.cc

Index: cc/surfaces/surface.cc
diff --git a/cc/surfaces/surface.cc b/cc/surfaces/surface.cc
index b3565a5158ecc29c350ca1965a95153d3a82ec3d..0e08ec4f5461c849b14bd8585c6a56476868900c 100644
--- a/cc/surfaces/surface.cc
+++ b/cc/surfaces/surface.cc
@@ -5,6 +5,7 @@
 #include "cc/surfaces/surface.h"
 
 #include "cc/output/compositor_frame.h"
+#include "cc/output/copy_output_request.h"
 #include "cc/surfaces/surface_factory.h"
 
 namespace cc {
@@ -50,6 +51,11 @@ void Surface::QueueFrame(scoped_ptr<CompositorFrame> frame,
   draw_callback_ = callback;
 }
 
+void Surface::RequestCopyOfOutput(scoped_ptr<CopyOutputRequest> copy_request) {
+  // TODO(jbauman): Make this work.
+  copy_request->SendEmptyResult();
+}
+
 const CompositorFrame* Surface::GetEligibleFrame() {
   return current_frame_.get();
 }