Issue #4277: move gl's constant variable to cc
Merge branch 'tests_js_3.0' of https://github.com/cocos2d/cocos2d-js-tests into Iss3427_NewEventDispatcher
Merge branch 'tests_js_3.0' of https://github.com/cocos2d/cocos2d-js-tests into Iss3427_NewEventDispatcher
Merge pull request #365 from dingpinglv/Iss4277_FixBugsForV3.0

Issue #4277: move gl's constant variable to cc