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This CL is adding the missing constuctors receiving the Location
information to ScopedBlockingCall. The location information is added
to the trace event with the same format than the top-level run tasks
events.

The ScopedBlockingCall constructors will be moved to the new
constructor with the Location in the following CLs.

R=gab@chromium.org

Bug: 934302
Change-Id: I6247a1ae099c45ebe9454cd74e9953a2add6e70f
Reviewed-on: https://chromium-review.googlesource.com/c/1479846Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634741}