Move output surface fallback from cc to embedders

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 2914cfcf8ee65dfd8896f57c480f8db709f15df1..ae3761b4b66c8096cc54dcc2fc8ce40570dfdbe3 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -107,7 +107,7 @@ class TestHooks : public AnimationDelegate {
                                Animation::TargetProperty target_property,
                                int group) override {}
 
-  virtual void RequestNewOutputSurface(bool fallback) = 0;
+  virtual void RequestNewOutputSurface() = 0;
 };
 
 class BeginTask;
@@ -199,11 +199,11 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   void DestroyLayerTreeHost();
 
   // By default, output surface recreation is synchronous.
-  void RequestNewOutputSurface(bool fallback) override;
+  void RequestNewOutputSurface() override;
   // Override this for pixel tests, where you need a real output surface.
-  virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback);
+  virtual scoped_ptr<OutputSurface> CreateOutputSurface();
   // Override this for unit tests, which should not produce pixel output.
-  virtual scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface(bool fallback);
+  virtual scoped_ptr<FakeOutputSurface> CreateFakeOutputSurface();
 
   TestWebGraphicsContext3D* TestContext();