Refactor TimeBase to post tasks. Workers to use real Idle tasks.

Source/platform/scheduler/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 Scheduler_h
 #define Scheduler_h
 
 #include "platform/PlatformExport.h"
 #include "public/platform/WebThread.h"
 #include "wtf/Functional.h"
@@ skipping 22 matching lines @@
     // Like postIdleTask but does not run the idle task until after some other
     // task has run. This enables posting of a task which won't stop the Blink
     // main thread from sleeping, but will start running after it wakes up.
     void postIdleTaskAfterWakeup(const WebTraceLocation&, PassOwnPtr<IdleTask>);
 
     // For tasks related to loading, e.g. HTML parsing.  Loading tasks usually have default priority
     // but they may be deprioritized when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|.
     void postLoadingTask(const WebTraceLocation&, WebThread::Task*);
 
+    void postTimerTask(const WebTraceLocation&, WebThread::Task*, long long delayMs);
+
     // Returns true if there is high priority work pending on the main thread
     // and the caller should yield to let the scheduler service that work.
     // Must be called on the main thread.
     bool shouldYieldForHighPriorityWork() const;
 
 protected:
     Scheduler(WebScheduler*);
     virtual ~Scheduler();
 
     static Scheduler* s_sharedScheduler;
     WebScheduler* m_webScheduler;
 };
 
 } // namespace blink
 
 #endif // Scheduler_h