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Add some instrumentation tests for Background Sync.
We currently don't have any that run on Android, and this CL
bridges that gap.

A previous attempt was made at this here:
https://chromium-review.googlesource.com/c/chromium/src/+/1534160

but it worked by fluke, since our test devices happened to have network
connectivity. That can't be guaranteed so this CL mocks out network
connection type.

It also mocks out BackgroundTaskScheduler because the last attempt
was failing to get the BackgroundTaskScheduler delegate for Android L
and below. This was because Google Play services isn't up to date on our
test devices.

Bug: 996664
Change-Id: I904664a87e31439a65c0f9a04a1c9c4b21d03bdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768321
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694759}