cc: Handle retroactive BeginFrames in the Scheduler.

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 d6eac972dfb1d1400359c837377a6514ad7061e5..3960f73c17dea6ca7f8c547e885a447d67913c0d 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -83,10 +83,10 @@ class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
         block_notify_ready_to_activate_for_testing_(false),
         notify_ready_to_activate_was_blocked_(false) {}
 
-  virtual void BeginImplFrame(const BeginFrameArgs& args) OVERRIDE {
-    test_hooks_->WillBeginImplFrameOnThread(this, args);
-    LayerTreeHostImpl::BeginImplFrame(args);
-    test_hooks_->DidBeginImplFrameOnThread(this, args);
+  virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE {
+    test_hooks_->WillBeginFrameOnThread(this, args);
+    LayerTreeHostImpl::BeginFrame(args);
+    test_hooks_->DidBeginFrameOnThread(this, args);
   }
 
   virtual void BeginMainFrameAborted(bool did_handle) OVERRIDE {
@@ -640,7 +640,7 @@ void LayerTreeTest::RunTest(bool threaded,
 
   delegating_renderer_ = delegating_renderer;
 
-  // Spend less time waiting for BeginImplFrame because the output is
+  // Spend less time waiting for BeginFrame because the output is
   // mocked out.
   settings_.refresh_rate = 200.0;
   if (impl_side_painting) {