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With surface sync on, the active tree is always expected to have a valid LocalSurfaceId, otherwise
surface invariants violations might be caused.

Bug: 672962
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I71dea254f4208c76189dacfb4c4682aa6a5d72cb
Reviewed-on: https://chromium-review.googlesource.com/960585Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542934}