Allow requesting a copy of a surface.

cc/surfaces/surface_factory.cc

Index: cc/surfaces/surface_factory.cc
diff --git a/cc/surfaces/surface_factory.cc b/cc/surfaces/surface_factory.cc
index 94f98fc7c374c40aaf0f347256a3e251dfd2f163..79bbe5eabd1cc762e8f836cccf02e7902f01e259 100644
--- a/cc/surfaces/surface_factory.cc
+++ b/cc/surfaces/surface_factory.cc
@@ -5,6 +5,7 @@
 #include "cc/surfaces/surface_factory.h"
 
 #include "cc/output/compositor_frame.h"
+#include "cc/output/copy_output_request.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "ui/gfx/geometry/size.h"
@@ -44,6 +45,18 @@ void SurfaceFactory::SubmitFrame(SurfaceId surface_id,
   manager_->SurfaceModified(surface_id);
 }
 
+void SurfaceFactory::RequestCopyOfSurface(
+    SurfaceId surface_id,
+    scoped_ptr<CopyOutputRequest> copy_request) {
+  OwningSurfaceMap::iterator it = surface_map_.find(surface_id);
+  if (it == surface_map_.end()) {
+    copy_request->SendEmptyResult();
+    return;
+  }
+  DCHECK(it->second->factory() == this);
+  it->second->RequestCopyOfOutput(copy_request.Pass());
+}
+
 void SurfaceFactory::ReceiveFromChild(
     const TransferableResourceArray& resources) {
   holder_.ReceiveFromChild(resources);