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

cc/trees/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/thread_proxy.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/auto_reset.h"
@@ skipping 677 matching lines @@
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ThreadProxy::BeginMainFrame,
                  main_thread_weak_ptr_,
                  base::Passed(&begin_main_frame_state)));
   devtools_instrumentation::DidRequestMainThreadFrame(
       impl().layer_tree_host_id);
   impl().timing_history.DidBeginMainFrame();
 }
 
+void ThreadProxy::SendBeginMainFrameNotExpectedSoon() {
+  Proxy::MainThreadTaskRunner()->PostTask(
+      FROM_HERE, base::Bind(&ThreadProxy::BeginMainFrameNotExpectedSoon,
+                            main_thread_weak_ptr_));
+}
+
 void ThreadProxy::BeginMainFrame(
     scoped_ptr<BeginMainFrameAndCommitState> begin_main_frame_state) {
   benchmark_instrumentation::ScopedBeginFrameTask begin_frame_task(
       benchmark_instrumentation::kDoBeginFrame,
       begin_main_frame_state->begin_frame_id);
   TRACE_EVENT_SYNTHETIC_DELAY_BEGIN("cc.BeginMainFrame");
   DCHECK(IsMainThread());
 
   if (main().defer_commits) {
     TRACE_EVENT_INSTANT0("cc", "EarlyOut_DeferCommit",
@@ skipping 140 matching lines @@
                    impl_thread_weak_ptr_,
                    &completion,
                    queue.release()));
     completion.Wait();
   }
 
   layer_tree_host()->CommitComplete();
   layer_tree_host()->DidBeginMainFrame();
 }
 
+void ThreadProxy::BeginMainFrameNotExpectedSoon() {
+  TRACE_EVENT0("cc", "ThreadProxy::BeginMainFrameNotExpectedSoon");

[Sami, 2015/02/11 15:28:25]

DCHECK(IsMainThread());

[rmcilroy, 2015/02/13 16:32:45]

Done.

+  layer_tree_host()->BeginMainFrameNotExpectedSoon();
+}
+
 void ThreadProxy::StartCommitOnImplThread(CompletionEvent* completion,
                                           ResourceUpdateQueue* raw_queue) {
   TRACE_EVENT0("cc", "ThreadProxy::StartCommitOnImplThread");
   DCHECK(!impl().commit_completion_event);
   DCHECK(IsImplThread() && IsMainThreadBlocked());
   DCHECK(impl().scheduler);
   DCHECK(impl().scheduler->CommitPending());
 
   if (!impl().layer_tree_host_impl) {
     TRACE_EVENT_INSTANT0(
@@ skipping 500 matching lines @@
 }
 
 void ThreadProxy::DidCompletePageScaleAnimationOnImplThread() {
   DCHECK(IsImplThread());
   Proxy::MainThreadTaskRunner()->PostTask(
       FROM_HERE, base::Bind(&ThreadProxy::DidCompletePageScaleAnimation,
                             main_thread_weak_ptr_));
 }
 
 }  // namespace cc