GitLab

This CL:
1. Fixes the screen tearing issue by getting rid of the GLKViewController,
   which runs its rendering loops and swaps buffers in unexpected moment. The
   GL view will now do on-demand buffer swapping, similar to how the Android
   client works.
2. Passes GL view dimensions to the renderer to fix the screen aspect issues.

BUG=716699

Review-Url: https://codereview.chromium.org/2848143002
Cr-Commit-Position: refs/heads/master@{#468418}