[iOS] Enable PAGE_VISIBILITY_API
https://bugs.webkit.org/show_bug.cgi?id=109399
Patch by Joseph Pecoraro <pecoraro@apple.com> on 2013-02-12
Reviewed by David Kilzer.
Source/JavaScriptCore:
* Configurations/FeatureDefines.xcconfig:
Source/WebCore:
* Configurations/FeatureDefines.xcconfig:
Source/WebKit/mac:
* Configurations/FeatureDefines.xcconfig:
Source/WebKit2:
* Configurations/FeatureDefines.xcconfig:
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@142701
268f45cc-cd09-0410-ab3c-
d52691b4dbfc