[SendTabToSelf] Added tests for sendtabtoself device info changes.

The tests check for two cases:
- When SendTabToSelf receiving is enabled on both devices, device
info for both are updated to reflect this.
- When SendTabToSelf receiving is disabled on one device, device
info accurately reflects this change.

Change-Id: Ie3350e66783890b8271d9700b1d6d4b35a8a84d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577946
Commit-Queue: Tanya Gupta <tgupta@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653364}
1 file changed