Add timestamps to synthesized events.

content/browser/renderer_host/input/synthetic_gesture.cc

 // Copyright 2013 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.
 
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 #include "content/browser/renderer_host/input/synthetic_pinch_gesture.h"
 #include "content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.h"
@@ skipping 25 matching lines @@
       return CreateGesture<SyntheticPinchGesture,
                            SyntheticPinchGestureParams>(gesture_params);
     case SyntheticGestureParams::TAP_GESTURE:
       return CreateGesture<SyntheticTapGesture,
                            SyntheticTapGestureParams>(gesture_params);
   }
   NOTREACHED() << "Invalid synthetic gesture type";
   return scoped_ptr<SyntheticGesture>();
 }
 
+// static
+double SyntheticGesture::ConvertTimestampToSeconds(
+    const base::TimeTicks& timestamp) {
+  return (timestamp - base::TimeTicks()).InSecondsF();
+}
+
 }  // namespace content