Make it possible to toggle MSAA for ES (EXT_multisample_compatibility)
Make it possible to toggle MSAA for ES (EXT_multisample_compatibility)

Make it possible to turn MSAA on and off for OpenGL ES, too.
Use EXT_multisample_compatibility.

The extension adds token:
        MULTISAMPLE_EXT                             0x809D

The token can be supplied to glEnable/glDisable/glGetInteger.

This is needed in order to support mixed samples in OpenGL ES. This is
important for path rendering Chromium command buffer integration.

Review URL: https://codereview.chromium.org/1270533002

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