Validate finiteness of HTMLMediaElement properties.

LayoutTests/media/video-currentTime-set2.html

Index: LayoutTests/media/video-currentTime-set2.html
diff --git a/LayoutTests/media/video-currentTime-set2.html b/LayoutTests/media/video-currentTime-set2.html
index 8221cca8d3046ad1e594f3714e648a6da14ca050..38b648ca0acb19edb8f291cb6daba7ceb3575c44 100644
--- a/LayoutTests/media/video-currentTime-set2.html
+++ b/LayoutTests/media/video-currentTime-set2.html
@@ -2,12 +2,15 @@
 <script src=media-file.js></script>
 <script src=video-test.js></script>
 <script>
-    waitForEvent('canplaythrough',  
-    function () { 
-        video.currentTime = 1.5; 
+    waitForEvent('canplaythrough',
+    function () {
+        testException("video.currentTime = -Infinity", "TypeError: Failed to set the 'currentTime' property on 'HTMLMediaElement': The value provided is infinite.");
+        testException("video.currentTime = Infinity", "TypeError: Failed to set the 'currentTime' property on 'HTMLMediaElement': The value provided is infinite.");
+        testException("video.currentTime = NaN", "TypeError: Failed to set the 'currentTime' property on 'HTMLMediaElement': The value provided is not a number.");
+        video.currentTime = 1.5;
         testExpected("video.currentTime.toFixed(1)", 1.5);
         video.play();
-        video.currentTime = 3.1; 
+        video.currentTime = 3.1;
         testExpected("video.currentTime.toFixed(1)", 3.1);
         endTest();
     });