Compile in Preference support lib

The Android Framework Preference classes are deprecated as of API level
Q in favor of the v7 Preference Support Library. Add the required
dependency so we can begin migrating.

The net effect of this migration is expected to be a reduction in
method count and binary size.

Bug: 966073
Binary-Size: New support library import
Change-Id: I6b1f2f762f131567db31a6d9c314c71142866cfe
Commit-Queue: Natalie Chouinard <>
Reviewed-by: Andrew Grieve <>
Cr-Original-Commit-Position: refs/heads/master@{#665184}
Cr-Mirrored-Commit: c909bb82c23c68d21aa3ea4232ae12dc5c3030dd
1 file changed