Add a histogram for applying updates read from disk.

Add a histogram for applying updates read from disk.
Also add an entry for hash prefix map generation.

BUG=543161
Committed: https://crrev.com/62b5a16da46142fc65373fb70987c5e0de160ed5
Cr-Commit-Position: refs/heads/master@{#414140}

[vakh (use Gerrit instead), 2016-08-22 22:45:56]

The CQ bit was checked by vakh@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-22 22:46:52]

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

[vakh (use Gerrit instead), 2016-08-22 22:48:11]

vakh@chromium.org changed reviewers:
+ nparker@chromium.org, rkaplow@chromium.org

[commit-bot: I haz the power, 2016-08-23 00:06:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-23 00:06:23]

Dry run: This issue passed the CQ dry run.

[rkaplow, 2016-08-24 14:24:32]

lgtm

[vakh (use Gerrit instead), 2016-08-24 16:02:18]

The CQ bit was checked by vakh@chromium.org

[commit-bot: I haz the power, 2016-08-24 16:02:59]

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, 2016-08-24 17:30:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-24 17:30:49]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[vakh (use Gerrit instead), 2016-08-24 18:04:28]

The CQ bit was checked by vakh@chromium.org

[commit-bot: I haz the power, 2016-08-24 18:05:24]

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, 2016-08-24 20:51:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-24 20:53:23]

Description was changed from

==========
Add a histogram for applying updates read from disk.
Also add an entry for hash prefix map generation.

BUG=543161
==========

to

==========
Add a histogram for applying updates read from disk.
Also add an entry for hash prefix map generation.

BUG=543161

Committed: https://crrev.com/62b5a16da46142fc65373fb70987c5e0de160ed5
Cr-Commit-Position: refs/heads/master@{#414140}
==========

[commit-bot: I haz the power, 2016-08-24 20:53:24]

Patchset 1 (id:??) landed as
https://crrev.com/62b5a16da46142fc65373fb70987c5e0de160ed5
Cr-Commit-Position: refs/heads/master@{#414140}