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This patch adds and implements the new interfaces/methods for Bluetooth
socket. Compared with the old interfaces, the new ones:
- add a sock_type field (RFCOMM or L2CAP);
- pass Android socket flags directly instead of parsing those into BlueZ
  flags on Android side, to avoid expose two groups of constants in
  Android.

Also marks the old methods as deprecated, which will be removed when the
corresponding patch(es) are landed in both P and R.

Android patch see: http://ag/12418518

BUG=b:163099156
TEST=manually tested on octopus with P to make sure the old code path
  for RFCOMM still works; also see the TEST line in Android patch for R.

Change-Id: Ic35732e4e9ee6a45599f9aecd6b2695b60dd124a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366445
Commit-Queue: Jie Jiang <jiejiang@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813048}