cc: Toward merging DrawFrame and SwapBuffers in DelegatingRenderer.

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index 6bd79e5615247fe68e7d235710cbe98ad870e630..812859359cbfcc07594e156afcbc2f02f6b03cdc 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -183,9 +183,10 @@ class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
     return test_hooks_->PrepareToDrawOnThread(this, frame, draw_result);
   }
 
-  void DrawLayers(FrameData* frame) override {
-    LayerTreeHostImpl::DrawLayers(frame);
+  bool SwapBuffers(const FrameData& frame) override {

[danakj, 2016/09/07 00:25:35]

Eventually LTHI::SwapBuffers will become DrawLayers again. Or maybe it'll all be
PrepareToDraw we'll see.

+    bool r = LayerTreeHostImpl::SwapBuffers(frame);
     test_hooks_->DrawLayersOnThread(this);
+    return r;
   }
 
   void NotifyReadyToActivate() override {