[cc] Add and plumb CFS::DidNotProduceFrame.

services/ui/ws/frame_generator_unittest.cc

Index: services/ui/ws/frame_generator_unittest.cc
diff --git a/services/ui/ws/frame_generator_unittest.cc b/services/ui/ws/frame_generator_unittest.cc
index 03aef330bc0a16480fe56d8318314d4899301ade..000dd69c59c32bea1746ae1d36405e705df30b50 100644
--- a/services/ui/ws/frame_generator_unittest.cc
+++ b/services/ui/ws/frame_generator_unittest.cc
@@ -65,6 +65,11 @@ class FakeCompositorFrameSink : public cc::CompositorFrameSink,
   void SubmitCompositorFrame(cc::CompositorFrame frame) override {
     ++number_frames_received_;
     last_frame_ = std::move(frame);
+    last_begin_frame_ack_ = last_frame_.metadata.begin_frame_ack;
+  }
+
+  void BeginFrameDidNotProduceFrame(const cc::BeginFrameAck& ack) override {
+    last_begin_frame_ack_ = ack;
   }
 
   // cc::BeginFrameObserver implementation.
@@ -85,9 +90,7 @@ class FakeCompositorFrameSink : public cc::CompositorFrameSink,
     UpdateNeedsBeginFramesInternal();
   }
 
-  void OnDidFinishFrame(const cc::BeginFrameAck& ack) override {
-    begin_frame_source_->DidFinishFrame(this, ack);
-  }
+  void OnDidFinishFrame(const cc::BeginFrameAck& ack) override {}
 
   void SetBeginFrameSource(cc::BeginFrameSource* source) {
     if (begin_frame_source_ && observing_begin_frames_) {
@@ -108,6 +111,10 @@ class FakeCompositorFrameSink : public cc::CompositorFrameSink,
 
   int number_frames_received() { return number_frames_received_; }
 
+  const cc::BeginFrameAck& last_begin_frame_ack() {

[sunnyps, 2017/05/22 07:17:12]

nit: const method

[Eric Seckler, 2017/05/22 11:29:58]

Done.

+    return last_begin_frame_ack_;
+  }
+
  private:
   void UpdateNeedsBeginFramesInternal() {
     if (!begin_frame_source_)
@@ -131,6 +138,7 @@ class FakeCompositorFrameSink : public cc::CompositorFrameSink,
   bool observing_begin_frames_ = false;
   bool needs_begin_frames_ = false;
   cc::CompositorFrame last_frame_;
+  cc::BeginFrameAck last_begin_frame_ack_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCompositorFrameSink);
 };
@@ -194,7 +202,7 @@ class FrameGeneratorTest : public testing::Test {
   }
 
   const cc::BeginFrameAck& LastBeginFrameAck() {
-    return begin_frame_source_->LastAckForObserver(compositor_frame_sink_);
+    return compositor_frame_sink_->last_begin_frame_ack();
   }
 
  private: