cc: Dedup IPCs to return resources to client

cc/test/fake_output_surface.cc

Index: cc/test/fake_output_surface.cc
diff --git a/cc/test/fake_output_surface.cc b/cc/test/fake_output_surface.cc
index f8a9b7cb6e0a40f83a2b2677ac338086bb92f54a..4860f647daeaf775c407c52304ecc59834d11340 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -6,7 +6,6 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
-#include "cc/output/compositor_frame_ack.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/resources/returned_resource.h"
 #include "cc/test/begin_frame_args_test.h"
@@ -102,7 +101,8 @@ void FakeOutputSurface::SetTreeActivationCallback(
   client_->SetTreeActivationCallback(callback);
 }
 
-void FakeOutputSurface::ReturnResource(unsigned id, CompositorFrameAck* ack) {
+void FakeOutputSurface::ReturnResource(unsigned id,
+                                       ReturnedResourceArray* resources) {
   TransferableResourceArray::iterator it;
   for (it = resources_held_by_parent_.begin();
        it != resources_held_by_parent_.end();
@@ -111,7 +111,7 @@ void FakeOutputSurface::ReturnResource(unsigned id, CompositorFrameAck* ack) {
       break;
   }
   DCHECK(it != resources_held_by_parent_.end());
-  ack->resources.push_back(it->ToReturnedResource());
+  resources->push_back(it->ToReturnedResource());
   resources_held_by_parent_.erase(it);
 }