Enable unprefixed CSS Transforms by default

As discussed on blink-dev[1]. This change enables unprefixed CSS
Transforms[2] properties by default, it does not remove the
prefixed versions.

[1] https://groups.google.com/a/chromium.org/d/topic/blink-dev/vjyd8It--3Y/discussion
[2] http://www.w3.org/TR/css3-transforms/

BUG=154772

Review URL: https://codereview.chromium.org/223243002

git-svn-id: svn://svn.chromium.org/blink/trunk@170738 bbb929c8-8fbe-4397-9dbb-9b2b20218538
diff --git a/LayoutTests/virtual/stable/webexposed/css-properties-as-js-properties-expected.txt b/LayoutTests/virtual/stable/webexposed/css-properties-as-js-properties-expected.txt
index 8386b0d..f0ad016 100644
--- a/LayoutTests/virtual/stable/webexposed/css-properties-as-js-properties-expected.txt
+++ b/LayoutTests/virtual/stable/webexposed/css-properties-as-js-properties-expected.txt
@@ -4,6 +4,7 @@
 alignItems
 alignSelf
 alignmentBaseline
+backfaceVisibility
 background
 backgroundAttachment
 backgroundBlendMode
@@ -157,6 +158,8 @@
 pageBreakInside
 paintOrder
 parentRule
+perspective
+perspectiveOrigin
 pointerEvents
 position
 quotes
@@ -200,6 +203,9 @@
 textUnderlineWidth
 top
 touchAction
+transform
+transformOrigin
+transformStyle
 transition
 transitionDelay
 transitionDuration
diff --git a/Source/platform/RuntimeEnabledFeatures.in b/Source/platform/RuntimeEnabledFeatures.in
index ac09557..0e3cb6f 100644
--- a/Source/platform/RuntimeEnabledFeatures.in
+++ b/Source/platform/RuntimeEnabledFeatures.in
@@ -37,7 +37,7 @@
 CSSStickyPosition status=experimental
 CSSTouchAction status=stable
 CSSTouchActionDelay status=test
-CSSTransformsUnprefixed status=experimental
+CSSTransformsUnprefixed status=stable
 CSSViewport status=experimental
 CSSWillChange status=experimental
 CSS3Text status=experimental