Expand tap highlight to allow multiple highlights for touch disambiguation.

Source/WebKit/chromium/src/LinkHighlight.cpp

Index: Source/WebKit/chromium/src/LinkHighlight.cpp
diff --git a/Source/WebKit/chromium/src/LinkHighlight.cpp b/Source/WebKit/chromium/src/LinkHighlight.cpp
index 866b1e3bdcd877ad54fd61d9811099ec6fcc9a98..15dfc71a72a9f0057bc3044184c015f70a7d343c 100644
--- a/Source/WebKit/chromium/src/LinkHighlight.cpp
+++ b/Source/WebKit/chromium/src/LinkHighlight.cpp
@@ -142,7 +142,7 @@ RenderLayer* LinkHighlight::computeEnclosingCompositingLayer()
             clearGraphicsLayerLinkHighlightPointer();
 
         m_currentGraphicsLayer = newGraphicsLayer;
-        m_currentGraphicsLayer->setLinkHighlight(this);
+        m_currentGraphicsLayer->addLinkHighlight(this);
     }
 
     return renderLayer;
@@ -283,7 +283,7 @@ void LinkHighlight::startHighlightAnimationIfNeeded()
 void LinkHighlight::clearGraphicsLayerLinkHighlightPointer()
 {
     if (m_currentGraphicsLayer) {
-        m_currentGraphicsLayer->setLinkHighlight(0);
+        m_currentGraphicsLayer->removeLinkHighlight(this);
         m_currentGraphicsLayer = 0;
     }
 }