Move IdleTask to WebThread side 1/3

public/platform/WebThread.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 
 // Always an integer value.
 typedef uintptr_t PlatformThreadId;
 
 // Provides an interface to an embedder-defined thread implementation.
 //
 // Deleting the thread blocks until all pending, non-delayed tasks have been
 // run.
 class BLINK_PLATFORM_EXPORT WebThread {
 public:
+    // 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;
+    };
+
     class BLINK_PLATFORM_EXPORT Task {
     public:
         virtual ~Task() { }
         virtual void run() = 0;
     };
 
     class BLINK_PLATFORM_EXPORT TaskObserver {
     public:
         virtual ~TaskObserver() { }
         virtual void willProcessTask() = 0;
@@ skipping 26 matching lines @@
 #ifdef INSIDE_BLINK
     // Helpers for posting bound functions as tasks.
     void postTask(const WebTraceLocation&, PassOwnPtr<Function<void()>>);
     void postDelayedTask(const WebTraceLocation&, PassOwnPtr<Function<void()>>, long long delayMs);
 #endif
 };
 
 } // namespace blink
 
 #endif