Surface synchronization: Check surface invariants on Android

We would like to start a Finch trial for surface sync on Android soon.
This CL re-enables Android-specific surface invariants violations checks
on Android by removing code in RenderWidgetHostImpl that bypasses those
checks. This CL also ensures that when the background transparency
changes a new LocalSurfaceId is allocated as this matches the behavior
pre-surface-sync.

Bug: 672962, 789259, 801350
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iad2dc6c508770314ea33eb53f05944609f29b0b9
Reviewed-on: https://chromium-review.googlesource.com/1104315
Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568091}