The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7830751b710ff32cee5d36c5524e217fd5e2a5e9

commit 7830751b710ff32cee5d36c5524e217fd5e2a5e9
Author: Kyle Horimoto <khorimoto@google.com>
Date: Sat Jul 22 00:05:21 2017

[CrOS Tether] Fix scan behavior of HostScanner.

Previously, when a scan began, we would clear all existing scan results
from the cache, then add results back to the cache as the scan
progressed. This was janky because it would result in the UI removing
Tether networks and then adding them back shortly afterwards when scan
results came in.

This CL changes this functionality so that results are only removed
after a scan ends and the associated device is not found.

Bug: 672263,  746726 
Change-Id: I6df2516b1bc0e604c3a496838804bc6ee5c8292c
Reviewed-on: https://chromium-review.googlesource.com/581633
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488817}
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/fake_host_scan_cache.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/fake_host_scan_cache.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/host_scan_cache.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/host_scanner.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/host_scanner.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/host_scanner_unittest.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/master_host_scan_cache.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/master_host_scan_cache.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/master_host_scan_cache_unittest.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/network_host_scan_cache.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/network_host_scan_cache.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/network_host_scan_cache_unittest.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/persistent_host_scan_cache_impl.cc
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/persistent_host_scan_cache_impl.h
[modify] https://crrev.com/7830751b710ff32cee5d36c5524e217fd5e2a5e9/chromeos/components/tether/persistent_host_scan_cache_impl_unittest.cc

Your change meets the bar and is auto-approved for M61. Please go ahead and merge the CL to branch 3163 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), ketakid @(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6e71611e1bceddfe8fa4a757bcc33345f42677c3

commit 6e71611e1bceddfe8fa4a757bcc33345f42677c3
Author: Kyle Horimoto <khorimoto@google.com>
Date: Tue Jul 25 22:01:41 2017

[CrOS Tether] Fix scan behavior of HostScanner.

Previously, when a scan began, we would clear all existing scan results
from the cache, then add results back to the cache as the scan
progressed. This was janky because it would result in the UI removing
Tether networks and then adding them back shortly afterwards when scan
results came in.

This CL changes this functionality so that results are only removed
after a scan ends and the associated device is not found.

TBR=khorimoto@google.com

(cherry picked from commit 7830751b710ff32cee5d36c5524e217fd5e2a5e9)

Bug: 672263,  746726 
Change-Id: I6df2516b1bc0e604c3a496838804bc6ee5c8292c
Reviewed-on: https://chromium-review.googlesource.com/581633
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#488817}
Reviewed-on: https://chromium-review.googlesource.com/584862
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/branch-heads/3163@{#39}
Cr-Branched-From: ff259bab28b35d242e10186cd63af7ed404fae0d-refs/heads/master@{#488528}
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/fake_host_scan_cache.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/fake_host_scan_cache.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/host_scan_cache.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/host_scanner.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/host_scanner.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/host_scanner_unittest.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/master_host_scan_cache.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/master_host_scan_cache.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/master_host_scan_cache_unittest.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/network_host_scan_cache.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/network_host_scan_cache.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/network_host_scan_cache_unittest.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/persistent_host_scan_cache_impl.cc
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/persistent_host_scan_cache_impl.h
[modify] https://crrev.com/6e71611e1bceddfe8fa4a757bcc33345f42677c3/chromeos/components/tether/persistent_host_scan_cache_impl_unittest.cc