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There are race conditions in Bluetooth which can cause errors when
starting and stopping discovery sessions too close to one another.
In the worst case, these issues can cause a crash.

This CL rate-limits BLE advertisements and scans to at most one per
200ms. This reduces the possibility of race conditions in the kernel.

Bug: 768523, 672263
Change-Id: I985aec16b6f9cd80c385ab9af199daff4fb50ced
Reviewed-on: https://chromium-review.googlesource.com/683756Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504291}