Move //components/metrics/compression_utils into standalone component

Move //components/metrics/compression_utils into standalone component

This file is used by code in //chrome/browser/metrics/variations that itself is
slated for componentization. As //components/metrics depends on
//components/variations, the code in question would not be able to be
componentized into //components/variations. To enable that, this CL moves
compression_utils* to a standalone lower-level component.

BUG=516662, 515695
TBR=agl

Committed: https://crrev.com/64fedf1a9022ce13d9885cf3bebac417f4a73b45
Cr-Commit-Position: refs/heads/master@{#345309}

[blundell, 2015-08-19 11:16:49]

blundell@chromium.org changed reviewers:
+ asvitkine@chromium.org

[Alexei Svitkine (slow), 2015-08-24 15:54:59]

LGTM

Please also add crbug.com/515695 to the BUG= line.

[blundell, 2015-08-25 07:58:39]

On 2015/08/24 15:54:59, Alexei Svitkine (OOO Aug15-24) wrote:
> LGTM
> 
> Please also add crbug.com/515695 to the BUG= line.

Done.

[blundell, 2015-08-25 11:09:18]

blundell@chromium.org changed reviewers:
+ agl@chromium.org

[blundell, 2015-08-25 11:09:19]

TBR=agl for the dependency from //components/compression to //third_party/zlib:
it's just a move of the pre-existing dependency that was in
//components/metrics.

[blundell, 2015-08-25 11:09:23]

The CQ bit was checked by blundell@chromium.org

[blundell, 2015-08-25 11:09:23]

The patchset sent to the CQ was uploaded after l-g-t-m from
asvitkine@chromium.org
Link to the patchset: https://codereview.chromium.org/1304563003/#ps80001
(title: "Rebase")

[commit-bot: I haz the power, 2015-08-25 11:09:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304563003/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304563003/80001

[commit-bot: I haz the power, 2015-08-25 12:22:37]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-08-25 12:23:16]

Patchset 5 (id:??) landed as
https://crrev.com/64fedf1a9022ce13d9885cf3bebac417f4a73b45
Cr-Commit-Position: refs/heads/master@{#345309}