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Previously, ParentLocalSurfaceIdAllocator would default to an invalid
LocalSurfaceId. A new LSI had to be explicitly allocated before the
normal behavior could use it.

With ParentLocalSurfaceIdAllocator now default initializing a valid LSI,
the various call sites no longer need to explicitly check for the
uninitialized state.

viz/service & viz/test contain some of those call sites.

BUG=837030

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Iace37fb0be4c6389fdf2c89dbd4bb77c9696036f
Reviewed-on: https://chromium-review.googlesource.com/1038124
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555306}