Fix the drift in repeating timers.

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"
 
@@ skipping 48 matching lines @@
     // Schedule a loading task to be run on the the associated WebThread. 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*) { }
 
     // Schedule a timer task to be run on the the associated WebThread. Timer Tasks
     // tasks usually have the default priority, but may be delayed
     // when the user is interacting with the device.
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
-    virtual void postTimerTask(const WebTraceLocation&, WebThread::Task*, long long delayMs) {}
+    virtual void postTimerTask(const WebTraceLocation&, WebThread::Task*, double delaySecs) {}
 
     // Schedule a timer task to be run on the the associated WebThread. Timer Tasks
     // tasks usually have the default priority, but may be delayed
     // when the user is interacting with the device.
     // |monotonicTime| is in the timebase of WTF::monotonicallyIncreasingTime().
     // Takes ownership of |WebThread::Task|. Can be called from any thread.
     virtual void postTimerTaskAt(const WebTraceLocation&, WebThread::Task*, double monotonicTime) {}
 
     // Suspends the timer queue and increments the timer queue suspension count.
     // May only be called from the main thread.
@@ skipping 11 matching lines @@
     void postIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postNonNestableIdleTask(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postIdleTaskAfterWakeup(const WebTraceLocation&, PassOwnPtr<IdleTask>);
     void postLoadingTask(const WebTraceLocation&, PassOwnPtr<Task>);
 #endif
 };
 
 } // namespace blink
 
 #endif // WebScheduler_h