Move some Document timers to frame-specific task runners.

third_party/WebKit/Source/core/frame/FrameTimer.h

+// Copyright 2016 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 FrameTimer_h
+#define FrameTimer_h
+
+#include "core/dom/TaskRunnerHelper.h"
+#include "platform/Timer.h"
+
+namespace blink {
+
+template <typename TimerFiredClass>
+class FrameTimer : public TaskRunnerTimer<TimerFiredClass> {
+ public:
+  using TimerFiredFunction =
+      typename TaskRunnerTimer<TimerFiredClass>::TimerFiredFunction;
+
+  FrameTimer(TaskType taskType,

[alex clarke (OOO till 29th), 2016/10/19 09:15:51]

I suspect it will be somewhat common for the timer class to also be an execution
context so how about adding a second constructor:

template <typename T>
FrameTimer(TaskType taskType,
           T* timerFiredClassAndContext,
           TimerFiredFunction timerFiredFunction)
    : TaskRunnerTimer<TimerFiredClass>(
             TaskRunnerHelper::get(taskType, timerFiredClassAndContext),
             timerFiredClassAndContext,
             timerFiredFunction) {}

+             ExecutionContext* context,
+             TimerFiredClass* timerFiredClass,
+             TimerFiredFunction timerFiredFunction)
+      : TaskRunnerTimer<TimerFiredClass>(
+            TaskRunnerHelper::get(taskType, context),
+            timerFiredClass,
+            timerFiredFunction) {}
+};
+
+}  // namespace blink
+
+#endif  // FrameTimer_h