Sync the Screen interface with CSSOM View

Source/core/frame/Screen.idl

Index: Source/core/frame/Screen.idl
diff --git a/Source/core/frame/Screen.idl b/Source/core/frame/Screen.idl
index 309d1c5cc743bcd6e40f7387aeda3364e1ba4c88..675d000890e1c57128ac089264d19666ab0a66e1 100644
--- a/Source/core/frame/Screen.idl
+++ b/Source/core/frame/Screen.idl
@@ -26,16 +26,20 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// http://dev.w3.org/csswg/cssom-view/#the-screen-interface
 
 [
     GarbageCollected,
 ] interface Screen {
-    readonly attribute unsigned long height;
+    // TODO(philipj): availWidth/availHeight/width/height should not be unsigned.
+    readonly attribute unsigned long availWidth;
+    readonly attribute unsigned long availHeight;
     readonly attribute unsigned long width;
+    readonly attribute unsigned long height;
     readonly attribute unsigned long colorDepth;
     readonly attribute unsigned long pixelDepth;
-    readonly attribute long availLeft;
-    readonly attribute long availTop;
-    readonly attribute unsigned long availHeight;
-    readonly attribute unsigned long availWidth;
+
+    // Non-standard
+    [Measure] readonly attribute long availLeft;
+    [Measure] readonly attribute long availTop;
 };