Add AwDataReductionProxyManager

Add AwDataReductionProxyManager

This class reads the settings, enables/disables the data reduction
proxy, and sets the data reduction proxy auth key.

BUG=451287
Committed: https://crrev.com/962ad3b89fe5306082c18dd58d61a822b76daae5
Cr-Commit-Position: refs/heads/master@{#313320}

[hush (inactive), 2015-01-23 02:10:38]

hush@chromium.org changed reviewers:
+ sgurun@chromium.org

[hush (inactive), 2015-01-23 02:10:38]

to enable it:
frameworks/webview/chromium/tools/webview_command_line --enable-spdy-proxy-auth

[sgurun-gerrit only, 2015-01-23 02:16:43]

seems ok, but let's wait for the test runs to turn green at least once.

[sgurun-gerrit only, 2015-01-27 17:59:16]

On 2015/01/23 02:16:43, sgurun wrote:
> seems ok, but let's wait for the test runs to turn green at least once.

lgtm

[hush (inactive), 2015-01-27 18:13:02]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2015-01-27 18:14:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870883002/1

[commit-bot: I haz the power, 2015-01-27 19:06:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 19:07:24]

Patchset 1 (id:??) landed as
https://crrev.com/962ad3b89fe5306082c18dd58d61a822b76daae5
Cr-Commit-Position: refs/heads/master@{#313320}