GitLab

- Automatically deduce WriteType based on properties
- Set initial connected State on RemoteDevice

BUG=internal b/75967216
TEST=cast_bluetooth_unittests. Manual

Change-Id: I7b06f2cfaae180b4e76322675a02712fdff69d04
Reviewed-on: https://chromium-review.googlesource.com/1038754
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555601}