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

Source/platform/WebThreadSupportingGC.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 WebThreadSupportingGC_h
 #define WebThreadSupportingGC_h
 
 #include "platform/heap/glue/MessageLoopInterruptor.h"
 #include "platform/heap/glue/PendingGCRunner.h"
 #include "public/platform/Platform.h"
@@ skipping 19 matching lines @@
     void postTask(const WebTraceLocation& location, WebThread::Task* task)
     {
         m_thread->postTask(location, task);
     }
 
     void postDelayedTask(const WebTraceLocation& location, WebThread::Task* task, long long delayMs)
     {
         m_thread->postDelayedTask(location, task, delayMs);
     }
 
+    void postIdleTask(const WebTraceLocation& location, WebThread::IdleTask* idleTask)
+    {
+        m_thread->postIdleTask(location, idleTask);
+    }
+
+    void postIdleTaskAfterWakeup(const WebTraceLocation& location, WebThread::IdleTask* idleTask)
+    {
+        m_thread->postIdleTaskAfterWakeup(location, idleTask);
+    }
+
     bool isCurrentThread() const
     {
         return m_thread->isCurrentThread();
     }
 
     void addTaskObserver(WebThread::TaskObserver* observer)
     {
         m_thread->addTaskObserver(observer);
     }
 
@@ skipping 31 matching lines @@
     // A WorkerThread might get deleted before it had a chance to properly
     // shut down. By deleting the WebThread first, we can guarantee that
     // no pending tasks on the thread might want to access any of the other
     // members during the WorkerThread's destruction.
     OwnPtr<WebThread> m_thread;
 };
 
 }
 
 #endif