[cc] Add and plumb CFS::DidNotProduceFrame.

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 777df13fbaf20a3f8ee050f8dbaeb505d1f8de3c..c610cad1dbed62dd10a23c7cc2af9387e4dc6c0e 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -807,6 +807,10 @@ void SingleThreadProxy::DidFinishImplFrame() {
 #endif
 }
 
+void SingleThreadProxy::BeginFrameDidNotProduceFrame(const BeginFrameAck& ack) {

[sunnyps, 2017/05/22 07:17:13]

nit: Set the impl task runner so that DCHECKs for impl thread don't get tripped.
Like this:
DebugScopedSetImplThread impl(task_runner_provider_);

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

Done.

+  layer_tree_host_impl_->BeginFrameDidNotProduceFrame(ack);
+}
+
 void SingleThreadProxy::DidReceiveCompositorFrameAck() {
   layer_tree_host_->DidReceiveCompositorFrameAck();
 }