The bug would only manifest after a glUseProgram(0) at a specific time.
Fix the bug by releasing the uniform buffer to the Renderer instead.

Bug: angleproject:2397
Change-Id: Ia071da5af00dfc740e0fc20864d41f7b3e0afda4
Reviewed-on: https://chromium-review.googlesource.com/1110712
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Luc Ferron <lucferron@chromium.org>