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Throttle begin-frames to clients until gpu is done processing the
earlier swaps. This helps with reducing work when the gpu has a high
load, by not sending begin-frames to clients.

The clients always keep receiving the compositor-frame-ack messages
when a surface becomes activated (or replaces an older pending frame),
even if the gpu is busy doing work from earlier frames. So this change
introduces the back pressure by way of withholding begin-frames so
clients have to do less work.

BUG=877906

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: If34eb5c5af03961e17932c8f57caf352d0362bab
Reviewed-on: https://chromium-review.googlesource.com/c/1282219Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601383}