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 1a6529bc557f1dfeaf8c330bd89e6eb8747d6311..54af214d1ca118490594f472e415c7853b54da1e 100644
--- a/cc/trees/occlusion_tracker_unittest.cc
+++ b/cc/trees/occlusion_tracker_unittest.cc
@@ -169,7 +169,9 @@ 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;
 
@@ -431,6 +433,7 @@ 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_;