Vibration API: use runtime flag, change from client to platform.

public/platform/Platform.h

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 375 matching lines @@
     virtual void setSharedTimerFireInterval(double) { }
     virtual void stopSharedTimer() { }
 
     // Callable from a background WebKit thread.
     virtual void callOnMainThread(void (*func)(void*), void* context) { }
 
     // Checks the partition/volume where fileName resides.
     virtual long long availableDiskSpaceInBytes(const WebString& fileName) { return 0; }
 
 
+    // Vibration -----------------------------------------------------------
+
+    // Starts a vibration for the given duration in milliseconds. If there is currently an active
+    // vibration it will be cancelled before the new one is started.
+    virtual void vibrate(unsigned time) { }
+
+    // Cancels the current vibration, if there is one.
+    virtual void cancelVibration() { }
+
+
     // Testing -------------------------------------------------------------
 
 #define HAVE_WEBUNITTESTSUPPORT 1
     // Get a pointer to testing support interfaces. Will not be available in production builds.
     virtual WebUnitTestSupport* unitTestSupport() { return 0; }
 
 
     // Tracing -------------------------------------------------------------
 
     // Get a pointer to the enabled state of the given trace category. The
@@ skipping 127 matching lines @@
     // If null, the platform stops providing device motion data to the current listener.
     virtual void setDeviceMotionListener(WebKit::WebDeviceMotionListener*) { }
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace WebKit
 
 #endif