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By default LayerTreeSettings::enable_surface_synchronization was false.
Most cc_unittests were running with the default. This CL switches the
default to true and fixes most tests.

The primary change for tests is with regards to LocalSurfaceId
allocation. With surface sync off LocalSurfaceIds would be allocated
automatically. With surface sync on the test has to ensure new
LocalSurfaceIds are allocated at the correct time.

Bug: 985009
Change-Id: I9bd62da2b96f9eddb4ea85656c61364c0ee5ada8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774309
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692220}