Make cc output surface creation async

cc/trees/occlusion_tracker_unittest.cc

Index: cc/trees/occlusion_tracker_unittest.cc
diff --git a/cc/trees/occlusion_tracker_unittest.cc b/cc/trees/occlusion_tracker_unittest.cc
index 297a0925adf925f203355b1e1a86c7a9c3545233..b35e437bd3a955467c2ffe1ca9df32403470c54c 100644
--- a/cc/trees/occlusion_tracker_unittest.cc
+++ b/cc/trees/occlusion_tracker_unittest.cc
@@ -176,7 +176,9 @@ int OcclusionTrackerTestImplThreadTypes::next_layer_impl_id = 1;
 template <typename Types> class OcclusionTrackerTest : public testing::Test {
  protected:
   explicit OcclusionTrackerTest(bool opaque_layers)
-      : opaque_layers_(opaque_layers), host_(FakeLayerTreeHost::Create()) {}
+      : opaque_layers_(opaque_layers),
+        client_(FakeLayerTreeHostClient::DIRECT_3D),
+        host_(FakeLayerTreeHost::Create(&client_)) {}
 
   virtual void RunMyTest() = 0;
 
@@ -441,6 +443,7 @@ template <typename Types> class OcclusionTrackerTest : public testing::Test {
   }
 
   bool opaque_layers_;
+  FakeLayerTreeHostClient client_;
   scoped_ptr<FakeLayerTreeHost> host_;
   // These hold ownership of the layers for the duration of the test.
   typename Types::LayerPtrType root_;