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

third_party/WebKit/Source/core/page/AutoscrollController.h

Index: third_party/WebKit/Source/core/page/AutoscrollController.h
diff --git a/third_party/WebKit/Source/core/page/AutoscrollController.h b/third_party/WebKit/Source/core/page/AutoscrollController.h
index 85611a767f72597bb919ca0b32084cd772f8ef7a..aab9602b556b8e82be2e8816bd4aa46b459fbc7f 100644
--- a/third_party/WebKit/Source/core/page/AutoscrollController.h
+++ b/third_party/WebKit/Source/core/page/AutoscrollController.h
@@ -30,6 +30,7 @@
 #include "platform/geometry/FloatSize.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/heap/Handle.h"
+#include "wtf/Time.h"
 
 namespace blink {
 
@@ -69,7 +70,7 @@ class CORE_EXPORT AutoscrollController final
   void updateAutoscrollLayoutObject();
   void updateDragAndDrop(Node* targetNode,
                          const IntPoint& eventPosition,
-                         double eventTime);
+                         TimeTicks eventTime);
   void handleMouseReleaseForMiddleClickAutoscroll(LocalFrame*,
                                                   const PlatformMouseEvent&);
   void startMiddleClickAutoscroll(LayoutBox*, const IntPoint&);
@@ -88,7 +89,7 @@ class CORE_EXPORT AutoscrollController final
   LayoutBox* m_pressedLayoutObject;
   AutoscrollType m_autoscrollType;
   IntPoint m_dragAndDropAutoscrollReferencePosition;
-  double m_dragAndDropAutoscrollStartTime;
+  TimeTicks m_dragAndDropAutoscrollStartTime;
   IntPoint m_middleClickAutoscrollStartPos;
   bool m_didLatchForMiddleClickAutoscroll;
 };