oop: Fix windows oop raster gr context creation.

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}

ui/gl/init/create_gr_gl_interface.cc

@@ -87,6 +87,7 @@ sk_sp<const GrGLInterface> CreateGrGLInterface(
   functions->fBindAttribLocation = gl->glBindAttribLocationFn;
   functions->fBindBuffer = gl->glBindBufferFn;
   functions->fBindFragDataLocation = gl->glBindFragDataLocationFn;
+  functions->fBindUniformLocation = gl->glBindUniformLocationCHROMIUMFn;
   functions->fBeginQuery = gl->glBeginQueryFn;
   functions->fBindTexture = gl->glBindTextureFn;