Reduce hit test on ShowPress by moving event targeting to WebViewImpl

Source/web/WebViewImpl.h

Index: Source/web/WebViewImpl.h
diff --git a/Source/web/WebViewImpl.h b/Source/web/WebViewImpl.h
index c53c42608a5fc8c65a7efa48c5257b0b144cd97e..11beb0741e1c7a2f8474dc7e92fbc7d4adbb0eb4 100644
--- a/Source/web/WebViewImpl.h
+++ b/Source/web/WebViewImpl.h
@@ -31,6 +31,7 @@
 #ifndef WebViewImpl_h
 #define WebViewImpl_h
 
+#include "core/page/EventWithHitTestResults.h"
 #include "core/page/PagePopupDriver.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/geometry/IntRect.h"
@@ -432,8 +433,8 @@ public:
     void fullFramePluginZoomLevelChanged(double zoomLevel);
 
     void computeScaleAndScrollForBlockRect(const WebPoint& hitPoint, const WebRect& blockRect, float padding, float defaultScaleWhenAlreadyLegible, float& scale, WebPoint& scroll);
-    Node* bestTapNode(const PlatformGestureEvent& tapEvent);
-    void enableTapHighlightAtPoint(const PlatformGestureEvent& tapEvent);
+    Node* bestTapNode(const GestureEventWithHitTestResults& targetedTapEvent);
+    void enableTapHighlightAtPoint(const GestureEventWithHitTestResults& targetedTapEvent);
     void enableTapHighlights(WillBeHeapVector<RawPtrWillBeMember<Node> >&);
     void computeScaleAndScrollForFocusedNode(Node* focusedNode, float& scale, IntPoint& scroll, bool& needAnimation);
 
@@ -571,6 +572,8 @@ private:
     virtual bool handleKeyEvent(const WebKeyboardEvent&) OVERRIDE;
     virtual bool handleCharEvent(const WebKeyboardEvent&) OVERRIDE;
 
+    bool handleGestureScrollEvent(const WebGestureEvent&);
+
     InputMethodContext* inputMethodContext();
     WebPlugin* focusedPluginIfInputMethodSupported(LocalFrame*);