[cc] Add and plumb CFS::DidNotProduceFrame.

cc/scheduler/scheduler_unittest.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/scheduler/scheduler.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 105 matching lines @@
     PushAction("WillBeginImplFrame");
     if (will_begin_impl_frame_requests_one_begin_impl_frame_)
       scheduler_->SetNeedsOneBeginImplFrame();
     if (will_begin_impl_frame_causes_redraw_)
       scheduler_->SetNeedsRedraw();
   }
   void DidFinishImplFrame() override {
     EXPECT_TRUE(inside_begin_impl_frame_);
     inside_begin_impl_frame_ = false;
   }
+  void BeginFrameDidNotProduceFrame(const BeginFrameAck& ack) override {}
 
   void ScheduledActionSendBeginMainFrame(const BeginFrameArgs& args) override {
     PushAction("ScheduledActionSendBeginMainFrame");
     last_begin_main_frame_args_ = args;
   }
 
   const BeginFrameArgs& last_begin_main_frame_args() {
     return last_begin_main_frame_args_;
   }
 
@@ skipping 3631 matching lines @@
       BeginFrameArgs::kInvalidFrameNumber;
   bool has_damage = false;
   EXPECT_EQ(
       BeginFrameAck(args.source_id, args.sequence_number,
                     latest_confirmed_sequence_number, has_damage),
       fake_external_begin_frame_source_->LastAckForObserver(scheduler_.get()));
 }
 
 }  // namespace
 }  // namespace cc