Implement a Hit Test Cache.

Source/core/layout/svg/line/SVGInlineTextBox.cpp

Index: Source/core/layout/svg/line/SVGInlineTextBox.cpp
diff --git a/Source/core/layout/svg/line/SVGInlineTextBox.cpp b/Source/core/layout/svg/line/SVGInlineTextBox.cpp
index 7cecfd24d5054f8f7f1d13557ee0cdb865c4e198..c23909c86bb72595c471e366ceecdc175ed8ab09 100644
--- a/Source/core/layout/svg/line/SVGInlineTextBox.cpp
+++ b/Source/core/layout/svg/line/SVGInlineTextBox.cpp
@@ -266,7 +266,7 @@ bool SVGInlineTextBox::nodeAtPoint(HitTestResult& result, const HitTestLocation&
             // FIXME: both calls to rawValue() below is temporary and should be removed once the transition
             // to LayoutUnit-based types is complete (crbug.com/321237)
             if (locationInContainer.intersects(rect.rawValue())) {
-                layoutObject().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
+                layoutObject().updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset), rect);
                 if (!result.addNodeToListBasedTestResult(layoutObject().node(), locationInContainer, rect.rawValue()))
                     return true;
             }