gpu: Remove SwapInterval from command buffer

We don't call this from outside GPU process. It's hard to properly
support this anyway except for enabling/disabling vsync which we do
based on command-line flags in PassThroughImageTransportSurface.

Follow-up CL will remove SetSwapInterval from GLContext and add
SetVSyncEnabled to GLSurface which will be used for enabling/disabling
vsync.

R=piman
BUG=480361

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: If742a9c6b7a87644b76d42b6f602cd440826550b
Reviewed-on: https://chromium-review.googlesource.com/956550
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542006}
21 files changed