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In order to synchronize top/bottom bar controls with web content we need to allocate
a new LocalSurfaceId on the impl thread whenever the renderer compositor wants to
reposition them. This CL does so.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I1cf41134ecaefa9df963769725b1af86c7739435
Bug: : 672962
Reviewed-on: https://chromium-review.googlesource.com/1058311
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558781}