[cc] Add and plumb CFS::DidNotProduceFrame.

cc/scheduler/scheduler_unittest.cc

Index: cc/scheduler/scheduler_unittest.cc
diff --git a/cc/scheduler/scheduler_unittest.cc b/cc/scheduler/scheduler_unittest.cc
index c920854083cde3d7d2b750cd71d8d25760058525..1049445fa7f0a331cdac6d95d20dd391e2679ca3 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -123,6 +123,7 @@ class FakeSchedulerClient : public SchedulerClient,
     EXPECT_TRUE(inside_begin_impl_frame_);
     inside_begin_impl_frame_ = false;
   }
+  void DidNotProduceFrame(const BeginFrameAck& ack) override {}
 
   void ScheduledActionSendBeginMainFrame(const BeginFrameArgs& args) override {
     PushAction("ScheduledActionSendBeginMainFrame");