Allow tasks scheduled for the instant virtual time budges expires to run

third_party/WebKit/public/platform/scheduler/renderer/renderer_scheduler.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 THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 #define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 141 matching lines @@
   // prioritize loading tasks for a short duration afterwards.
   // Must be called from the main thread.
   virtual void OnNavigationStarted() = 0;
 
   // Returns true if the scheduler has reason to believe that high priority work
   // may soon arrive on the main thread, e.g., if gesture events were observed
   // recently.
   // Must be called from the main thread.
   virtual bool IsHighPriorityWorkAnticipated() = 0;
 
-  // Suspends the timer queue and increments the timer queue suspension count.
+  // Suspends the timer queues and increments the timer queue suspension count.
   // May only be called from the main thread.
   virtual void SuspendTimerQueue() = 0;
 
-  // Decrements the timer queue suspension count and re-enables the timer queue
+  // Decrements the timer queue suspension count and re-enables the timer queues
   // if the suspension count is zero and the current schduler policy allows it.
   virtual void ResumeTimerQueue() = 0;
 
+  // Suspends the timer queues by inserting a fence that blocks any tasks posted
+  // after this point from running. Orthogonal to SuspendTimerQueue. Care must
+  // be taken when using this API to avoid fighting with the TaskQueueThrottler.
+  virtual void InsertTimerFence() = 0;
+
+  // Removes the fence added by InsertTimerFence allowing timers to execute
+  // normally. Care must be taken when using this API to avoid fighting with the
+  // TaskQueueThrottler.
+  virtual void RemoveTimerFence() = 0;
+
   // Sets whether to allow suspension of timers after the backgrounded signal is
   // received via OnRendererBackgrounded. Defaults to disabled.
   virtual void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) = 0;
 
   // Sets the default blame context to which top level work should be
   // attributed in this renderer. |blame_context| must outlive this scheduler.
   virtual void SetTopLevelBlameContext(
       base::trace_event::BlameContext* blame_context) = 0;
 
   // The renderer scheduler maintains an estimated RAIL mode[1]. This observer
@@ skipping 11 matching lines @@
 
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_