Move IdleTask to WebThread side 1/3

public/platform/WebScheduler.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 WebScheduler_h
 #define WebScheduler_h
 
 #include "WebCommon.h"
 #include "public/platform/WebThread.h"
 
 namespace blink {
 
 class WebTraceLocation;
 
 // This class is used to submit tasks and pass other information from Blink to
 // the platform's scheduler.
 class BLINK_PLATFORM_EXPORT WebScheduler {
 public:
     virtual ~WebScheduler() { }
 
-    // An IdleTask is passed a deadline in CLOCK_MONOTONIC seconds and is
-    // expected to complete before this deadline.
-    class IdleTask {
-    public:
-        virtual ~IdleTask() { }
-        virtual void run(double deadlineSeconds) = 0;
-    };
+    typedef WebThread::IdleTask IdleTask;
 
     // 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.
     virtual bool shouldYieldForHighPriorityWork() { return false; }
 
     // Returns true if a currently running idle task could exceed its deadline
     // without impacting user experience too much. This should only be used if
     // there is a task which cannot be pre-empted and is likely to take longer
     // than the largest expected idle task deadline. It should NOT be polled to
@@ skipping 25 matching lines @@
     // Schedule a loading task to be run on the Blink main thread. Loading
     // tasks usually have the default priority, but may be deprioritised
     // when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
     virtual void postLoadingTask(const WebTraceLocation&, WebThread::Task*) { }
 };
 
 } // namespace blink
 
 #endif // WebScheduler_h