https://bugs.webkit.org/show_bug.cgi?id=57910

Patch by Said Abou-Hallawa <sabouhallawa@apple.com> on 2014-09-25
Reviewed by Dean Jackson.

Source/WebCore:

Tests: animations/change-keyframes.html

* css/WebKitCSSKeyframesRule.h:
(WebCore::WebKitCSSKeyframesRule::appendRule):
-- Make WebKitCSSKeyframesRule::appendRule to be an alias of WebKitCSSKeyframesRule::insertRule()
   to conform with CSS specs
* css/WebKitCSSKeyframesRule.idl:
-- Add the new method WebKitCSSKeyframesRule::appendRule() but keep the original method
   WebKitCSSKeyframesRule::appendRule() to not break exiting customers' pages.

LayoutTests:

* animations/change-keyframes.html:
-- Ensure both WebKitCSSKeyframesRule methods insertRule() and appendRule() are
   both supported.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@173982 268f45cc-cd09-0410-ab3c-d52691b4dbfc