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

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 84125df7bd71fc340acfb806624a14f9c8927378..acc6ea41610eb7bfa384edc1ad4c3ba3e5368d6d 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -429,6 +429,10 @@ class WEB_EXPORT WebViewImpl final
 
   void animateDoubleTapZoom(const IntPoint&);
 
+  void resolveTapDisambiguation(double timestampSeconds,
+                                WebPoint tapViewportOffset,
+                                bool isLongPress) override;
+
   void enableFakePageScaleAnimationForTesting(bool);
   bool fakeDoubleTapAnimationPendingForTesting() const {
     return m_doubleTapZoomPending;
@@ -708,6 +712,8 @@ class WEB_EXPORT WebViewImpl final
   std::unique_ptr<CompositorAnimationTimeline> m_linkHighlightsTimeline;
   std::unique_ptr<FullscreenController> m_fullscreenController;
 
+  WebPoint m_lastTapDisambiguationBestCandidatePosition;
+
   WebColor m_baseBackgroundColor;
   bool m_baseBackgroundColorOverrideEnabled;
   WebColor m_baseBackgroundColorOverride;