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This change implements SendCachedDevices(), which should be called
after Bluetooth service in Android starts, to make device cache synced
between Chrome and Android. Here "cache devices" means devices that
have been discovered (not necessarily paired or connected) but not yet
expired. Some Android apps depend on this device cache, e.g., get info
of paired devices.

BUG=b:147401863
BUG=chromium:949918
TEST=Manually test with nRF: paired device can be seen in "BONDED" tab
after reboot or restart Bluetooth.

Change-Id: I80a813706770e9505b6b1db7a502739723e71f69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000398
Commit-Queue: Jie Jiang <jiejiang@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736233}