Issue #4277: fixed cc.eventManager, cc.Texture2DCanvas and EGLView's bug
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into Iss4277_FixBugsForV3.0
Merge pull request #1649 from dingpinglv/Iss4277_FixBugsForV3.0

Issue #4277: fixed cc.eventManager, cc.Texture2DCanvas and EGLView's bug