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GrGLFunction is a std::function today, but we'd like to slim that down.
This will let us change its underlying type seamlessly.

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: I9f9c3d4b56e6d6fb6db82c8f47ddf74fdca6476d
Reviewed-on: https://chromium-review.googlesource.com/580129Reviewed-by: Brian Salomon <bsalomon@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488394}