Add GAMEPAD feature flag

Add GAMEPAD feature flag
https://bugs.webkit.org/show_bug.cgi?id=66859

Patch by Scott Graham <scottmg@chromium.org> on 2011-10-04
Reviewed by Darin Fisher.

.:

* configure.ac:

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig:

Source/WebCore:

No new tests, as no new functionality yet.

* Configurations/FeatureDefines.xcconfig:
* GNUmakefile.am:
* features.pri:

Source/WebKit/chromium:

* features.gypi:

Source/WebKit/mac:

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

* Configurations/FeatureDefines.xcconfig:

Tools:

* Scripts/build-webkit:

WebKitLibraries:

* win/tools/vsprops/FeatureDefines.vsprops:
* win/tools/vsprops/FeatureDefinesCairo.vsprops:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@96662 268f45cc-cd09-0410-ab3c-d52691b4dbfc