GitLab

Introduce better lifetime management for BluetoothAdapterCast, allowing
the Cast embedder code to inject a factory for this class. This prevents
potential races at destruct time.

Also wires up the code to make Characteristic notifications work. With
this patch (and some hacks in content), a JS application can receive
notifications successfully.

BUG=827672

Bug: b/75967216
Test: test page
Change-Id: Idb8a1ba2c9ad94a80940083d31e307b3506f98e6
Reviewed-on: https://chromium-review.googlesource.com/988265
Commit-Queue: Stephen Lanham <slan@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547922}