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Adds some of the methods previously defined only in the
LeScanManagerImpl and GattClientManagerImpl as part of the abstract
interfaces. Making this change helps keeping the Bluetooth logic
consistent between Cast and Fuchsia platforms.

Bug: b/161948793
Test: bluetooth unittests
Change-Id: I24f4de56bcc6c564cfdf2d6a8ed9bca899fb9b4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333567Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Commit-Queue: Marzena Dell'Aquila <mdellaquila@google.com>
Cr-Commit-Position: refs/heads/master@{#794307}