Make PointerEvent coordinates fractional for touch

third_party/WebKit/Source/core/events/MouseRelatedEvent.h

Index: third_party/WebKit/Source/core/events/MouseRelatedEvent.h
diff --git a/third_party/WebKit/Source/core/events/MouseRelatedEvent.h b/third_party/WebKit/Source/core/events/MouseRelatedEvent.h
index 6d90d75eaf845aba5b91e226656c5d2798e6d6e9..ac3d2cf5847780f931f3bcafd0b53fb4299d68ae 100644
--- a/third_party/WebKit/Source/core/events/MouseRelatedEvent.h
+++ b/third_party/WebKit/Source/core/events/MouseRelatedEvent.h
@@ -43,14 +43,24 @@ class CORE_EXPORT MouseRelatedEvent : public UIEventWithKeyState {
   };
   // Note that these values are adjusted to counter the effects of zoom, so that
   // values exposed via DOM APIs are invariant under zooming.
-  int screenX() const { return m_screenLocation.x(); }
-  int screenY() const { return m_screenLocation.y(); }
-  const IntPoint& screenLocation() const { return m_screenLocation; }
-  int clientX() const { return m_clientLocation.x().toInt(); }
-  int clientY() const { return m_clientLocation.y().toInt(); }
+  double screenX() const {
+    return isPointerEvent() ? m_screenLocation.x().toDouble()
+                            : m_screenLocation.x().toInt();
+  }
+  double screenY() const {
+    return isPointerEvent() ? m_screenLocation.y().toDouble()
+                            : m_screenLocation.y().toInt();
+  }
+  double clientX() const {
+    return isPointerEvent() ? m_clientLocation.x().toDouble()
+                            : m_clientLocation.x().toInt();
+  }
+  double clientY() const {
+    return isPointerEvent() ? m_clientLocation.y().toDouble()
+                            : m_clientLocation.y().toInt();
+  }
   int movementX() const { return m_movementDelta.x().toInt(); }
   int movementY() const { return m_movementDelta.y().toInt(); }
-  const LayoutPoint& clientLocation() const { return m_clientLocation; }
   int layerX();
   int layerY();
   int offsetX();
@@ -90,14 +100,14 @@ class CORE_EXPORT MouseRelatedEvent : public UIEventWithKeyState {
   MouseRelatedEvent(const AtomicString& type,
                     const MouseEventInit& initializer);
 
-  void initCoordinates(const LayoutPoint& clientLocation);
+  void initCoordinates(const double clientX, const double clientY);
   void receivedTarget() final;
 
   void computePageLocation();
   void computeRelativePosition();
 
   // Expose these so MouseEvent::initMouseEvent can set them.
-  IntPoint m_screenLocation;
+  LayoutPoint m_screenLocation;
   LayoutPoint m_clientLocation;
   LayoutPoint m_movementDelta;