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The GLFences used for backpressure in ImageTransportSurfaceOverlayMac
are objects that should be scoped to a GLContext, not a GLSurface. Add
methods to GLContext to allow creation and waiting on fences, and call
those methods from GLSurface.

Bug: 863817
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ib0fc8cac3efdd50f88c197c6bdeb2ee2e22696bd
Reviewed-on: https://chromium-review.googlesource.com/1146483
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577321}