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

content/renderer/scheduler/renderer_scheduler_impl.cc

 // Copyright 2014 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 "content/renderer/scheduler/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 103 matching lines @@
 
   base::TimeTicks now(Now());
   if (now < estimated_next_frame_begin_) {
     StartIdlePeriod();
     control_task_runner_->PostDelayedTask(FROM_HERE,
                                           end_idle_period_closure_.callback(),
                                           estimated_next_frame_begin_ - now);
   }
 }
 
+void RendererSchedulerImpl::BeginFrameNotExpectedSoon() {
+  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
+               "RendererSchedulerImpl::BeginFrameNotExpectedSoon");
+  // TODO(rmcilroy): Implement long idle times.
+}
+
 void RendererSchedulerImpl::DidReceiveInputEventOnCompositorThread(
     const blink::WebInputEvent& web_input_event) {
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                "RendererSchedulerImpl::DidReceiveInputEventOnCompositorThread");
   // We regard MouseMove events with the left mouse button down as a signal
   // that the user is doing something requiring a smooth frame rate.
   if (web_input_event.type == blink::WebInputEvent::MouseMove &&
       (web_input_event.modifiers & blink::WebInputEvent::LeftButtonDown)) {
     UpdateForInputEvent(web_input_event.type);
     return;
@@ skipping 305 matching lines @@
       // meaningful touchstart response and should not impact task priority.
       return current_state;
 
     default:
       break;
   }
   return INPUT_ACTIVE;
 }
 
 }  // namespace content