Don't kill a process if it has IMPORTANT_FOREGROUND or higher priority

Don't kill a process if it has IMPORTANT_FOREGROUND or higher priority

Actively killing IMPORTANT_FOREGROUND processes in Chrome doesn't make
much sense because the processes are user-visible to some extent and
because of that, they will likely respawn immediately after being
killed.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm we no longer see infinite
 the kill-respawn loop.

Review-Url: https://codereview.chromium.org/2852093003
Cr-Commit-Position: refs/heads/master@{#468788}
(cherry picked from commit b9b315ec73b88bebaaa1b45dd85b338392eb8fef)

Review-Url: https://codereview.chromium.org/2874023003 .
Cr-Commit-Position: refs/branch-heads/3071@{#509}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/22a4c0ee2fa868cb6560730ab8e579ddccb8c09c

[Yusuke Sato, 2017-05-11 04:14:22]

Description was changed from

==========
Don't kill a process if it has IMPORTANT_FOREGROUND or higher priority

Actively killing IMPORTANT_FOREGROUND processes in Chrome doesn't make
much sense because the processes are user-visible to some extent and
because of that, they will likely respawn immediately after being
killed.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm we no longer see infinite
 the kill-respawn loop.

Review-Url: https://codereview.chromium.org/2852093003
Cr-Commit-Position: refs/heads/master@{#468788}
(cherry picked from commit b9b315ec73b88bebaaa1b45dd85b338392eb8fef)
==========

to

==========
Don't kill a process if it has IMPORTANT_FOREGROUND or higher priority

Actively killing IMPORTANT_FOREGROUND processes in Chrome doesn't make
much sense because the processes are user-visible to some extent and
because of that, they will likely respawn immediately after being
killed.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm we no longer see infinite
 the kill-respawn loop.

Review-Url: https://codereview.chromium.org/2852093003
Cr-Commit-Position: refs/heads/master@{#468788}
(cherry picked from commit b9b315ec73b88bebaaa1b45dd85b338392eb8fef)

Review-Url: https://codereview.chromium.org/2874023003 .
Cr-Commit-Position: refs/branch-heads/3071@{#509}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/22a4c0ee2fa868cb6560730ab8e5...
==========

[Yusuke Sato, 2017-05-11 04:14:23]

Committed patchset #1 (id:1) manually as
22a4c0ee2fa868cb6560730ab8e579ddccb8c09c.