Remove PlatformGestureEvent in favour of using WebGestureEvent

third_party/WebKit/Source/platform/PlatformMouseEvent.h

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 #ifndef PlatformMouseEvent_h
 #define PlatformMouseEvent_h
 
 #include "platform/PlatformEvent.h"
+#include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntPoint.h"
+#include "public/platform/WebGestureEvent.h"
 #include "public/platform/WebPointerProperties.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class PlatformMouseEvent : public PlatformEvent {
  public:
   enum SyntheticEventType {
     // Real mouse input events or synthetic events that behave just like real
     // events
@@ skipping 39 matching lines @@
                          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;
   }
 
+#if INSIDE_BLINK
+  PlatformMouseEvent(const WebGestureEvent& gestureEvent,
+                     WebPointerProperties::Button button,
+                     EventType type,
+                     int clickCount,
+                     Modifiers modifiers,
+                     SyntheticEventType synthesized,
+                     TimeTicks timestamp,
+                     WebPointerProperties::PointerType pointerType =
+                         WebPointerProperties::PointerType::Unknown)
+      : PlatformMouseEvent(flooredIntPoint(gestureEvent.positionInRootFrame()),
+                           IntPoint(gestureEvent.globalX, gestureEvent.globalY),
+                           button,
+                           type,
+                           clickCount,
+                           modifiers,
+                           synthesized,
+                           timestamp,
+                           pointerType) {}
+#endif
+
   const WebPointerProperties& pointerProperties() const {
     return m_pointerProperties;
   }
   const IntPoint& position() const { return m_position; }
   const IntPoint& globalPosition() const { return m_globalPosition; }
   const IntPoint& movementDelta() const { return m_movementDelta; }
 
   int clickCount() const { return m_clickCount; }
   bool fromTouch() const { return m_synthesized == FromTouch; }
   SyntheticEventType getSyntheticEventType() const { return m_synthesized; }
@@ skipping 18 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