[Reland] Make canceling Timers fast.

third_party/WebKit/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"
 #include "public/platform/WebTraceLocation.h"
 #include <memory>
@@ skipping 22 matching lines @@
     };
 
     // 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*) = 0;
 
     // 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) = 0;
 
+    // Schedule a task to be run after |delayMs| on the the associated WebThread.
+    // Can be called from any thread.
+    virtual void postDelayedTask(const WebTraceLocation&, const base::Closure&, double delayMs) = 0;
+
     // Returns a clone of the WebTaskRunner.
     virtual std::unique_ptr<WebTaskRunner> clone() = 0;
 
     // Returns true if the current thread is a thread on which a task may be run.
     // Can be called from any thread.
     virtual bool runsTasksOnCurrentThread() = 0;
 
     // ---
 
     // Headless Chrome virtualises time for determinism and performance (fast forwarding
@@ skipping 24 matching lines @@
 
     // For same-thread posting. Must be called from the associated WebThread.
     void postTask(const WebTraceLocation&, std::unique_ptr<WTF::Closure>);
     void postDelayedTask(const WebTraceLocation&, std::unique_ptr<WTF::Closure>, long long delayMs);
 #endif
 };
 
 } // namespace blink
 
 #endif // WebTaskRunner_h