Use WTF::TimeTicks to represent timestamp in Platform/Core event types

third_party/WebKit/Source/platform/PlatformMouseEvent.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 41 matching lines @@
       : PlatformEvent(type),
         m_clickCount(0),
         m_synthesized(RealOrIndistinguishable) {}
 
   PlatformMouseEvent(const IntPoint& position,
                      const IntPoint& globalPosition,
                      WebPointerProperties::Button button,
                      EventType type,
                      int clickCount,
                      Modifiers modifiers,
-                     double timestamp)
+                     TimeTicks timestamp)
       : PlatformEvent(type, modifiers, timestamp),
         m_position(position),
         m_globalPosition(globalPosition),
         m_clickCount(clickCount),
         m_synthesized(RealOrIndistinguishable) {
     m_pointerProperties.button = button;
   }
 
   PlatformMouseEvent(const IntPoint& position,
                      const IntPoint& globalPosition,
                      WebPointerProperties::Button button,
                      EventType type,
                      int clickCount,
                      Modifiers modifiers,
                      SyntheticEventType synthesized,
-                     double timestamp,
+                     TimeTicks timestamp,
                      WebPointerProperties::PointerType pointerType =
                          WebPointerProperties::PointerType::Unknown)
       : PlatformEvent(type, modifiers, timestamp),
         m_position(position),
         m_globalPosition(globalPosition),
         m_clickCount(clickCount),
         m_synthesized(synthesized) {
     m_pointerProperties.pointerType = pointerType;
     m_pointerProperties.button = button;
   }
@@ skipping 29 matching lines @@
   // For canvas hit region.
   // TODO(zino): This might make more sense to put in HitTestResults or
   // some other part of MouseEventWithHitTestResults, but for now it's
   // most convenient to stash it here. Please see: http://crbug.com/592947.
   String m_region;
 };
 
 }  // namespace blink
 
 #endif  // PlatformMouseEvent_h