Refine tap disambiguation UMA to track same-node/different-node.

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 411 matching lines @@
       const GestureEventWithHitTestResults& targetedTapEvent);
   void enableTapHighlights(HeapVector<Member<Node>>&);
   void computeScaleAndScrollForFocusedNode(Node* focusedNode,
                                            bool zoomInToLegibleScale,
                                            float& scale,
                                            IntPoint& scroll,
                                            bool& needAnimation);
 
   void animateDoubleTapZoom(const IntPoint&);
 
+  void resolveTapDisambiguation(double timestampSeconds,
+                                WebPoint tapViewportOffset,
+                                bool isLongPress) override;
+
   void enableFakePageScaleAnimationForTesting(bool);
   bool fakeDoubleTapAnimationPendingForTesting() const {
     return m_doubleTapZoomPending;
   }
   IntPoint fakePageScaleAnimationTargetPositionForTesting() const {
     return m_fakePageScaleAnimationTargetPosition;
   }
   float fakePageScaleAnimationPageScaleForTesting() const {
     return m_fakePageScaleAnimationPageScaleFactor;
   }
@@ skipping 259 matching lines @@
   MediaKeysClientImpl m_mediaKeysClientImpl;
   std::unique_ptr<WebActiveGestureAnimation> m_gestureAnimation;
   WebPoint m_positionOnFlingStart;
   WebPoint m_globalPositionOnFlingStart;
   int m_flingModifier;
   WebGestureDevice m_flingSourceDevice;
   Vector<std::unique_ptr<LinkHighlightImpl>> m_linkHighlights;
   std::unique_ptr<CompositorAnimationTimeline> m_linkHighlightsTimeline;
   std::unique_ptr<FullscreenController> m_fullscreenController;
 
+  WebPoint m_lastTapDisambiguationBestCandidatePosition;
+
   WebColor m_baseBackgroundColor;
   bool m_baseBackgroundColorOverrideEnabled;
   WebColor m_baseBackgroundColorOverride;
   WebColor m_backgroundColorOverride;
   float m_zoomFactorOverride;
 
   bool m_userGestureObserved;
   bool m_shouldDispatchFirstVisuallyNonEmptyLayout;
   bool m_shouldDispatchFirstLayoutAfterFinishedParsing;
   bool m_shouldDispatchFirstLayoutAfterFinishedLoading;
@@ skipping 23 matching lines @@
   Persistent<ResizeViewportAnchor> m_resizeViewportAnchor;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 }  // namespace blink
 
 #endif