Add docs for dealing with resource_sizes perf alerts

Add docs for dealing with resource_sizes perf alerts

BUG=none

Committed: https://crrev.com/03b96d664b9ddfda8ebb6c6c0ca15052eeb8daf4
Cr-Commit-Position: refs/heads/master@{#441447}

[agrieve, 2017-01-03 20:11:01]

agrieve@chromium.org changed reviewers:
+ sullivan@chromium.org

[agrieve, 2017-01-03 20:11:02]

📈

[sullivan, 2017-01-03 20:23:19]

lgtm

+benhenry since he's working on release process for speed, and APK size is part
of that.

[agrieve, 2017-01-04 18:42:24]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2017-01-04 18:42:51]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-04 20:12:43]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1483555344997060,
"parent_rev": "19336159e142ff0e91f545799979d1725d96abe1", "commit_rev":
"69bf9e0ed6580b830f61fff18f7dd98f349facc7"}

[commit-bot: I haz the power, 2017-01-04 20:13:12]

Description was changed from

==========
Add docs for dealing with resource_sizes perf alerts

BUG=none
==========

to

==========
Add docs for dealing with resource_sizes perf alerts

BUG=none

Review-Url: https://codereview.chromium.org/2609893003
==========

[commit-bot: I haz the power, 2017-01-04 20:13:13]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2017-01-04 20:15:17]

Description was changed from

==========
Add docs for dealing with resource_sizes perf alerts

BUG=none

Review-Url: https://codereview.chromium.org/2609893003
==========

to

==========
Add docs for dealing with resource_sizes perf alerts

BUG=none

Committed: https://crrev.com/03b96d664b9ddfda8ebb6c6c0ca15052eeb8daf4
Cr-Commit-Position: refs/heads/master@{#441447}
==========

[commit-bot: I haz the power, 2017-01-04 20:15:18]

Patchset 2 (id:??) landed as
https://crrev.com/03b96d664b9ddfda8ebb6c6c0ca15052eeb8daf4
Cr-Commit-Position: refs/heads/master@{#441447}