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Provide chrome switch to disable GMS scheduling of MediaStore periodic
indexing and corpora maintenance tasks.  Used in performance tast to
prevent running service during testing which can cause unstable results
or CPU not idle pre-test failures.

BUG=b:173906243
BUG=b:170071013
BUG=b:172010486
BUG=b:153866893
TEST=Used local build with https://crrev.com/c/2596242 to verify using
'getprop' that boot property is only available if chrome switch is set.

Change-Id: I72704a9814061af172e5f9a892513e0f414d31a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2597193
Commit-Queue: Alan Ding <alanding@chromium.org>
Reviewed-by: Long Cheng <lgcheng@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842275}