[WIP] Use the flat tree for hover handling.

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

Index: third_party/WebKit/Source/web/tests/WebFrameTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
index ba56e4afa4be5448c5fb194f62998595839f11d2..c1b57e52ca6d1ee699bd0349ce43531b595dda09 100644
--- a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
@@ -10803,7 +10803,7 @@ TEST_F(WebFrameTest, MouseOverDifferntNodeClearsTooltip) {
   document->frame()->eventHandler().handleMouseMoveEvent(
       mouseMoveOverLinkEvent, Vector<WebMouseEvent>());
 
-  EXPECT_EQ(document->hoverNode(),
+  EXPECT_EQ(document->hoverElement(),
             document->frame()->chromeClient().lastSetTooltipNodeForTesting());
   EXPECT_EQ(div1Tag,
             document->frame()->chromeClient().lastSetTooltipNodeForTesting());
@@ -10820,7 +10820,7 @@ TEST_F(WebFrameTest, MouseOverDifferntNodeClearsTooltip) {
   document->frame()->eventHandler().handleMouseMoveEvent(
       mouseMoveEvent, Vector<WebMouseEvent>());
 
-  EXPECT_EQ(document->hoverNode(),
+  EXPECT_EQ(document->hoverElement(),
             document->frame()->chromeClient().lastSetTooltipNodeForTesting());
   EXPECT_EQ(div2Tag,
             document->frame()->chromeClient().lastSetTooltipNodeForTesting());
@@ -10898,7 +10898,7 @@ TEST_F(WebFrameTest, MouseOverLinkAndOverlayScrollbar) {
   document->frame()->eventHandler().handleMousePressEvent(mousePressEvent);
 
   EXPECT_FALSE(document->activeHoverElement());
-  EXPECT_FALSE(document->hoverNode());
+  EXPECT_FALSE(document->hoverElement());
 
   WebMouseEvent mouseReleaseEvent(
       WebInputEvent::MouseUp, WebFloatPoint(18, aTag->offsetTop()),
@@ -10929,7 +10929,7 @@ TEST_F(WebFrameTest, MouseOverLinkAndOverlayScrollbar) {
   document->frame()->eventHandler().handleMousePressEvent(mousePressEvent);
 
   EXPECT_TRUE(document->activeHoverElement());
-  EXPECT_TRUE(document->hoverNode());
+  EXPECT_TRUE(document->hoverElement());
 
   document->frame()->eventHandler().handleMouseReleaseEvent(mouseReleaseEvent);
 }
@@ -10967,7 +10967,7 @@ TEST_F(WebFrameTest, MouseOverCustomScrollbar) {
       mouseMoveOverDiv, Vector<WebMouseEvent>());
 
   // DIV :hover
-  EXPECT_EQ(document->hoverNode(), scrollbarDiv);
+  EXPECT_EQ(document->hoverElement(), scrollbarDiv);
 
   // Ensure hittest has DIV and scrollbar
   hitTestResult = webView->coreHitTestResultAt(WebPoint(175, 1));
@@ -10986,7 +10986,7 @@ TEST_F(WebFrameTest, MouseOverCustomScrollbar) {
       mouseMoveOverDivAndScrollbar, Vector<WebMouseEvent>());
 
   // Custom not change the DIV :hover
-  EXPECT_EQ(document->hoverNode(), scrollbarDiv);
+  EXPECT_EQ(document->hoverElement(), scrollbarDiv);
   EXPECT_EQ(hitTestResult.scrollbar()->hoveredPart(), ScrollbarPart::ThumbPart);
 }
 
@@ -11033,7 +11033,7 @@ TEST_F(WebFrameTest, MouseOverScrollbarAndParentElement) {
       mouseMoveOverDiv, Vector<WebMouseEvent>());
 
   // DIV :hover.
-  EXPECT_EQ(document->hoverNode(), parentDiv);
+  EXPECT_EQ(document->hoverElement(), parentDiv);
 
   // Ensure hittest has DIV and scrollbar.
   hitTestResult = webView->coreHitTestResultAt(WebPoint(175, 5));
@@ -11053,7 +11053,7 @@ TEST_F(WebFrameTest, MouseOverScrollbarAndParentElement) {
       mouseMoveOverDivAndScrollbar, Vector<WebMouseEvent>());
 
   // Not change the DIV :hover.
-  EXPECT_EQ(document->hoverNode(), parentDiv);
+  EXPECT_EQ(document->hoverElement(), parentDiv);
 
   // Disable the Scrollbar by remove the childDiv.
   childDiv->remove();
@@ -11072,7 +11072,7 @@ TEST_F(WebFrameTest, MouseOverScrollbarAndParentElement) {
       mouseMoveOverDivAndScrollbar, Vector<WebMouseEvent>());
 
   // Not change the DIV :hover.
-  EXPECT_EQ(document->hoverNode(), parentDiv);
+  EXPECT_EQ(document->hoverElement(), parentDiv);
 }
 
 TEST_F(WebFrameTest, MouseReleaseUpdatesScrollbarHoveredPart) {