Switches windows to opengles 3 (#191516)

issue https://github.com/flutter/flutter/issues/191207

While researching https://github.com/flutter/flutter/issues/191207 it
was seen a lot of time was lost each frame for Map/Unmap. This seems to
be related to ANGLE's suboptimal code path for handling glUniform*
calls. We have support for UBOs in the opengles backend, but it requires
the OpenGLES 3 backend. This PR bumps us to OpenGLES 3 if it's supported
in order to get UBO usage.

This file is used by skia also, but skia supports opengles 3.0 too.

Local testing didn't seem to make a big difference. I couldn't run the
automated tests locally because they were hanging on my setup, but they
work fine on CI. We want to be on opengles 3 anyways since it gives us
more options for better performance.

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