Hit test SVG line boxes

third_party/WebKit/LayoutTests/svg/hittest/text-with-text-path.svg

+<svg onload="runTest()" width="500" height="150" viewBox="0 0 500 150" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <rect id="background" width="100%" height="100%" fill="blue" />
+    <text id="text">
+        <textPath id="textPath" xlink:href="#path">This is text on a path</textPath>
+    </text>
+    <defs>
+        <path id="path"
+              d="M 100 200
+              C 200 100 300   0 400 100
+              C 500 200 600 300 700 200
+              C 800 100 900 100 900 100" />
+        <style type="text/css">
+        <![CDATA[
+            @font-face {
+                font-family: Ahem;
+                src: url(../../resources/Ahem.ttf);
+            }
+            text {
+                font-family: Ahem;
+                font-size: 40px;
+            }
+        ]]>
+        </style>
+        <script type="text/javascript">
+        <![CDATA[
+            function runTest() {
+                if (window.testRunner)
+                    testRunner.dumpAsText();
+
+                // The point at 100,100 is contained within the text's bounding box
+                // but not in a painted part so the element should be the background.
+                // The point at 160,120 is contained within the text path's bounding
+                // box.
+                var text = document.getElementById("text");
+                var background = document.getElementById("background");
+                var textPath = document.getElementById("textPath");
+                if (document.elementFromPoint(160, 120) === textPath && document.elementFromPoint(100, 100) === background)
+                    text.textContent = "PASS";
+                else
+                    text.textContent = "FAIL";
+            }
+        ]]>
+        </script>
+    </defs>
+</svg>