scheduler: Disable expensive timers during main thread user input

components/scheduler/renderer/renderer_scheduler_impl.h

 // 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.
 
 #ifndef COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/synchronization/lock.h"
 #include "components/scheduler/child/idle_helper.h"
 #include "components/scheduler/child/pollable_thread_safe_flag.h"
 #include "components/scheduler/child/scheduler_helper.h"
 #include "components/scheduler/renderer/deadline_task_runner.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
+#include "components/scheduler/renderer/task_cost_estimator.h"
 #include "components/scheduler/scheduler_export.h"
 
 namespace base {
 namespace trace_event {
 class ConvertableToTraceFormat;
 }
 }
 
 namespace scheduler {
 
@@ skipping 166 matching lines @@
 
   base::Closure update_policy_closure_;
   DeadlineTaskRunner delayed_update_policy_runner_;
   CancelableClosureHolder end_renderer_hidden_idle_period_closure_;
 
   // We have decided to improve thread safety at the cost of some boilerplate
   // (the accessors) for the following data members.
 
   struct MainThreadOnly {
     MainThreadOnly();
+    ~MainThreadOnly();
 
+    TaskCostEstimator timer_task_cost_estimator_;
+    cc::RollingTimeDeltaHistory short_idle_period_duration_;
     Policy current_policy_;
     base::TimeTicks current_policy_expiration_time_;
     base::TimeTicks estimated_next_frame_begin_;
+    base::TimeDelta expected_short_idle_period_duration_;
     int timer_queue_suspend_count_;  // TIMER_TASK_QUEUE suspended if non-zero.
     bool renderer_hidden_;
     bool was_shutdown_;
   };
 
   struct AnyThread {
     AnyThread();
 
     base::TimeTicks last_input_signal_time_;
     base::TimeTicks last_idle_period_end_time_;
     base::TimeTicks rails_loading_priority_deadline_;
     int pending_main_thread_input_event_count_;
     bool awaiting_touch_start_response_;
     bool in_idle_period_;
     bool begin_main_frame_on_critical_path_;
+    bool timer_tasks_seem_expensive_;
   };
 
   struct CompositorThreadOnly {
     CompositorThreadOnly();
     ~CompositorThreadOnly();
 
     blink::WebInputEvent::Type last_input_type_;
     scoped_ptr<base::ThreadChecker> compositor_thread_checker_;
 
     void CheckOnValidThread() {
@@ skipping 39 matching lines @@
 
   PollableThreadSafeFlag policy_may_need_update_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_