[Temp] [Android] A temporary way to enable WebGL for Android port.

This is a workaround because some platforms do not support the
GL extension 'GL_{ARB,EXT}_robustness' and the reset notification.
But the pass rate is pretty good for IA platforms. Suggest to
enable WebGL. Do it by using '--ignore-gpu-blacklist' because
it'll bypass this kind of checking.

BUG=#831
Merge pull request #845 from yongsheng/webgl

[Android] Enable WebGL for Android port.