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This patch adds glUniformLocation function to be passed to Skia, since
it creates it when used on windows.

Running cc_unittests with --use-gpu-in-tests triggers an assert without
this patch, and passes with. I've also verified that the similar
behavior happens on poster circle.

R=piman@chromium.org, enne@chromium.org, bsalomon@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ie015bdf751e00ef9aa1f15ae6274fc26ae329249
Reviewed-on: https://chromium-review.googlesource.com/804951Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521515}