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This CL implements GLSurface PresentationCallback for GLX. It uses
OpenGL GpuTimer to query the |timestamp| for GPU finishes renderering
the back buffer, and use the closest VSync after the |timestamp| to
run presentation callback.

Bug: 776877
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: I87f40022555b988e9cbe5cd628979c15f6043f0d
Reviewed-on: https://chromium-review.googlesource.com/809704Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523646}