CSS Transforms: Implement backface-visibility

LayoutTests/transforms/backface-visibility-parsing.html

Index: LayoutTests/transforms/backface-visibility-parsing.html
diff --git a/LayoutTests/transforms/transform-style-parsing.html b/LayoutTests/transforms/backface-visibility-parsing.html
similarity index 55%
copy from LayoutTests/transforms/transform-style-parsing.html
copy to LayoutTests/transforms/backface-visibility-parsing.html
index 1011a63458002b8944a92475df9dd76253eddbed..1fcf6c771014fc96a6a902e1b1a626898e0cf2ba 100644
--- a/LayoutTests/transforms/transform-style-parsing.html
+++ b/LayoutTests/transforms/backface-visibility-parsing.html
@@ -4,13 +4,13 @@
 <div id="target"></div>
 <script src="resources/parsing-test-helper.js"></script>
 <script>
-expect = expect.bind(this, 'transform-style', 'transformStyle');
+expect = expect.bind(this, 'backface-visibility', 'backfaceVisibility');
 
-expect('initial').parsesAs('initial').isComputedTo('flat');
+expect('initial').parsesAs('initial').isComputedTo('visible');
 expect('inherit').parsesAs('inherit');
 
-expect('flat').parsesAs('flat').isComputedTo('flat');
-expect('preserve-3d').parsesAs('preserve-3d').isComputedTo('preserve-3d');
+expect('visible').parsesAs('visible').isComputedTo('visible');
+expect('hidden').parsesAs('hidden').isComputedTo('hidden');
 
 expect('none').isInvalid();
 expect('0').isInvalid();