Add webGLErrorsToConsoleEnabled Settings flag

Add webGLErrorsToConsoleEnabled Settings flag
https://bugs.webkit.org/show_bug.cgi?id=77696

Patch by Gregg Tavares <gman@google.com> on 2012-02-06
Reviewed by Kenneth Russell.

No new tests as there is no change in behavior.

* html/canvas/WebGLRenderingContext.cpp:
(WebCore):
(WebCore::WebGLRenderingContext::setupFlags):
* page/Settings.cpp:
(WebCore::Settings::Settings):
* page/Settings.h:
(Settings):
(WebCore::Settings::webGLErrorsToConsoleEnabled):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106881 268f45cc-cd09-0410-ab3c-d52691b4dbfc