[cc]: Add a BeginMainFrameNotExpectedSoon signal and route it to the RendererScheduler.

cc/trees/single_thread_proxy.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/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/output/context_provider.h"
@@ skipping 656 matching lines @@
   // (i.e. property modifications) causing some to fall on one frame and some to
   // fall on the next.  Doing it asynchronously instead matches the semantics of
   // ThreadProxy::SetNeedsCommit where SetNeedsCommit will not cause a
   // synchronous commit.
   MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&SingleThreadProxy::BeginMainFrame,
                  weak_factory_.GetWeakPtr()));
 }
 
+void SingleThreadProxy::SendBeginMainFrameNoLongerRequired() {
+  layer_tree_host_->BeginMainFrameNoLongerRequired();
+}
+
 void SingleThreadProxy::BeginMainFrame() {
   if (defer_commits_) {
     TRACE_EVENT_INSTANT0("cc", "EarlyOut_DeferCommit",
                          TRACE_EVENT_SCOPE_THREAD);
     BeginMainFrameAbortedOnImplThread(
         CommitEarlyOutReason::ABORTED_DEFERRED_COMMIT);
     return;
   }
 
   // This checker assumes NotifyReadyToCommit in this stack causes a synchronous
@@ skipping 128 matching lines @@
 
 void SingleThreadProxy::DidBeginImplFrameDeadline() {
   layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc