Revert of Add DeadlineOverrun step to the RendererSchedulerIdlePeriod trace event.

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 232 matching lines @@
 void RendererSchedulerImpl::StartIdlePeriod() {
   TRACE_EVENT_ASYNC_BEGIN0("renderer.scheduler",
                            "RendererSchedulerIdlePeriod", this);
   main_thread_checker_.CalledOnValidThread();
   renderer_task_queue_selector_->EnableQueue(
       IDLE_TASK_QUEUE, RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
   task_queue_manager_->PumpQueue(IDLE_TASK_QUEUE);
 }
 
 void RendererSchedulerImpl::EndIdlePeriod() {
-  bool is_tracing;
-  TRACE_EVENT_CATEGORY_GROUP_ENABLED("renderer.scheduler", &is_tracing);
-  if (is_tracing && base::TimeTicks::Now() > estimated_next_frame_begin_) {
-    TRACE_EVENT_ASYNC_STEP_INTO_WITH_TIMESTAMP0(
-        "renderer.scheduler",
-        "RendererSchedulerIdlePeriod",
-        this,
-        "DeadlineOverrun",
-        estimated_next_frame_begin_.ToInternalValue());
-  }
   TRACE_EVENT_ASYNC_END0("renderer.scheduler",
                          "RendererSchedulerIdlePeriod", this);
   main_thread_checker_.CalledOnValidThread();
   end_idle_period_closure_.Cancel();
   renderer_task_queue_selector_->DisableQueue(IDLE_TASK_QUEUE);
 }
 
 void RendererSchedulerImpl::SetTimeSourceForTesting(
     scoped_refptr<cc::TestNowSource> time_source) {
   main_thread_checker_.CalledOnValidThread();
@@ skipping 70 matching lines @@
   state->SetDouble("last_input_time",
                    (last_input_time_ - base::TimeTicks()).InMillisecondsF());
   state->SetDouble(
       "estimated_next_frame_begin",
       (estimated_next_frame_begin_ - base::TimeTicks()).InMillisecondsF());
 
   return state;
 }
 
 }  // namespace content