Move IdleTask to WebThread side 1/3

Source/platform/scheduler/Scheduler.cpp

 // 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.
 
 #include "config.h"
 #include "platform/scheduler/Scheduler.h"
 
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebTraceLocation.h"
 
 namespace blink {
 
-class IdleTaskRunner : public WebScheduler::IdleTask {
+class IdleTaskRunner : public WebThread::IdleTask {
     WTF_MAKE_NONCOPYABLE(IdleTaskRunner);
 
 public:
     explicit IdleTaskRunner(PassOwnPtr<Scheduler::IdleTask> task)
         : m_task(task)
     {
     }
 
     ~IdleTaskRunner() override
     {
     }
 
-    // WebScheduler::IdleTask implementation.
+    // WebThread::IdleTask implementation.
     void run(double deadlineSeconds) override
     {
         (*m_task)(deadlineSeconds);
     }
 private:
     OwnPtr<Scheduler::IdleTask> m_task;
 };
 
 Scheduler* Scheduler::s_sharedScheduler = nullptr;
 
@@ skipping 56 matching lines @@
 }
 
 bool Scheduler::canExceedIdleDeadlineIfRequired() const
 {
     if (m_webScheduler)
         return m_webScheduler->canExceedIdleDeadlineIfRequired();
     return false;
 }
 
 } // namespace blink