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This CL adds assertions in ScopedBlockingCall.
To distinguish between blocking and sync primitive assertions, a new class
was added, ScopedBlockingCallWithBaseSyncPrimitives. Usages of
ScopedBlockingCall were replaced by ScopedBlockingCallWithBaseSyncPrimitives
when appropriate.
Corresponding assertions were added (AssertBlockingAllowed and AssertBaseSyncPrimitivesAllowed)
in both ScopedBlockingCall and ScopedBlockingCallWithBaseSyncPrimitives.
In the future, either ScopedBlockingCall or ScopedBlockingCallWithBaseSyncPrimitives
will be used to mark all blocking tasks.

Bug: 874080
Change-Id: I8277436d4dd25dedb47d6fcdacc45f3905397647
Reviewed-on: https://chromium-review.googlesource.com/1178326Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586297}