Use high precision timestamp for Event.timestamp

Source/web/WebInputEventConversion.cpp

Index: Source/web/WebInputEventConversion.cpp
diff --git a/Source/web/WebInputEventConversion.cpp b/Source/web/WebInputEventConversion.cpp
index df65059f3854eea1db3b53d39b914e98e04c179d..26772c10a83805a21c78aee6501f64cc83e7a7a6 100644
--- a/Source/web/WebInputEventConversion.cpp
+++ b/Source/web/WebInputEventConversion.cpp
@@ -50,8 +50,6 @@
 
 namespace blink {
 
-static const double millisPerSecond = 1000.0;
-
 static float scaleDeltaToWindow(const Widget* widget, float delta)
 {
     float scale = 1;
@@ -320,6 +318,7 @@ PlatformKeyboardEventBuilder::PlatformKeyboardEventBuilder(const WebKeyboardEven
     m_key = Platform::current()->domKeyStringFromEnum(e.domKey);
 
     m_modifiers = toPlatformKeyboardEventModifiers(e.modifiers);
+    m_timestamp = e.timeStampSeconds;
 
     // FIXME: PlatformKeyboardEvents expect a locational version of the keycode (e.g. VK_LSHIFT
     // instead of VK_SHIFT). This should be changed so the location/keycode are stored separately,
@@ -480,7 +479,7 @@ static IntPoint convertAbsoluteLocationForLayoutObject(const LayoutPoint& locati
 // RemoteFrameViews.
 static void updateWebMouseEventFromCoreMouseEvent(const MouseRelatedEvent& event, const Widget* widget, const LayoutObject& layoutObject, WebMouseEvent& webEvent)
 {
-    webEvent.timeStampSeconds = event.timeStamp() / millisPerSecond;
+    webEvent.timeStampSeconds = event.timeStampForPlatformInSeconds();
     webEvent.modifiers = getWebInputModifiers(event);
 
     FrameView* view = widget ? toFrameView(widget->parent()) : 0;
@@ -570,7 +569,7 @@ WebMouseEventBuilder::WebMouseEventBuilder(const Widget* widget, const LayoutObj
     else
         return;
 
-    timeStampSeconds = event.timeStamp() / millisPerSecond;
+    timeStampSeconds = event.timeStampForPlatformInSeconds();
     modifiers = getWebInputModifiers(event);
 
     // The mouse event co-ordinates should be generated from the co-ordinates of the touch point.
@@ -628,7 +627,7 @@ WebKeyboardEventBuilder::WebKeyboardEventBuilder(const KeyboardEvent& event)
     else if (event.location() == KeyboardEvent::DOM_KEY_LOCATION_RIGHT)
         modifiers |= WebInputEvent::IsRight;
 
-    timeStampSeconds = event.timeStamp() / millisPerSecond;
+    timeStampSeconds = event.timeStampForPlatformInSeconds();
     windowsKeyCode = event.keyCode();
 
     // The platform keyevent does not exist if the event was created using
@@ -721,7 +720,7 @@ WebTouchEventBuilder::WebTouchEventBuilder(const LayoutObject* layoutObject, con
     }
 
     modifiers = getWebInputModifiers(event);
-    timeStampSeconds = event.timeStamp() / millisPerSecond;
+    timeStampSeconds = event.timeStampForPlatformInSeconds();
     cancelable = event.cancelable();
     causesScrollingIfUncanceled = event.causesScrollingIfUncanceled();
 
@@ -756,7 +755,7 @@ WebGestureEventBuilder::WebGestureEventBuilder(const LayoutObject* layoutObject,
         data.tap.tapCount = 1;
     }
 
-    timeStampSeconds = event.timeStamp() / millisPerSecond;
+    timeStampSeconds = event.timeStampForPlatformInSeconds();
     modifiers = getWebInputModifiers(event);
 
     globalX = event.screenX();