Introduce WebTaskRunner Patch 3/5

public/platform/WebTaskRunner.h

 // Copyright 2015 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 WebTaskRunner_h
 #define WebTaskRunner_h
 
 #include "WebCommon.h"
 
+#ifdef INSIDE_BLINK
+#include "wtf/Functional.h"
+#endif
+
 namespace blink {
 
 class WebTraceLocation;
 
 // The blink representation of a chromium SingleThreadTaskRunner.
 class BLINK_PLATFORM_EXPORT WebTaskRunner {
 public:
     virtual ~WebTaskRunner() {}
 
     class BLINK_PLATFORM_EXPORT Task {
     public:
         virtual ~Task() { }
         virtual void run() = 0;
     };
 
     // Schedule a task to be run on the the associated WebThread.
     // Takes ownership of |Task|. Can be called from any thread.
     virtual void postTask(const WebTraceLocation&, Task*) {}
 
     // Schedule a task to be run after |delayMs| on the the associated WebThread.
     // Takes ownership of |Task|. Can be called from any thread.
     // TODO(alexclarke): Remove this when possible.
     virtual void postDelayedTask(const WebTraceLocation&, Task*, long long delayMs) {}
 
     // Schedule a task to be run after |delayMs| on the the associated WebThread.
     // Takes ownership of |Task|. Can be called from any thread.
     virtual void postDelayedTask(const WebTraceLocation&, Task*, double delayMs) {}
 
-    // TODO(alexclarke): Add helpers for posting bound functions as tasks.
+#ifdef INSIDE_BLINK
+    // Helpers for posting bound functions as tasks.
+    typedef Function<void()> ClosureTask;
+
+    void postTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>);
+    // TODO(alexclarke): Remove this when possible.
+    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>, long long delayMs);
+    void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ClosureTask>, double delayMs);
+#endif
 };
 
 } // namespace blink
 
 #endif // WebTaskRunner_h