cc: Setup API to release OutputSurface from LTHClient.

cc/test/fake_proxy.h

Index: cc/test/fake_proxy.h
diff --git a/cc/test/fake_proxy.h b/cc/test/fake_proxy.h
index b908b037ed93c56053737274f4fc0c9487fc6a51..3f2f34073c70d268feae9b3a7bfc1129677816fd 100644
--- a/cc/test/fake_proxy.h
+++ b/cc/test/fake_proxy.h
@@ -25,6 +25,7 @@ class FakeProxy : public Proxy {
   bool IsStarted() const override;
   bool CommitToActiveTree() const override;
   void SetOutputSurface(scoped_ptr<OutputSurface>) override {}
+  scoped_ptr<OutputSurface> ReleaseOutputSurface() override;
   void SetLayerTreeHostClientReady() override {}
   void SetVisible(bool visible) override {}
   void SetThrottleFrameProduction(bool throttle) override {}