Improved Quickoffice editing about:flag.

Improved Quickoffice editing about:flag.

We were sniffing extension name from an alternate manifest to
drive experimental behaviour. This is apparant to the user and
unnecessary. Now we use the alternate manifest to inject experimental
feature capability into the background page that the extension
can query and use.

Change-Id: I6326d64b97723d0f102269cea02e5c9110e6fe1d

BUG=237052
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=206363

[dusk, 2013-06-11 19:27:34]

Improved solution for QO experimental feature enabling.

[Dmitry Polukhin, 2013-06-12 04:25:31]

https://codereview.chromium.org/15703018/diff/4001/chrome/browser/resources/q...
File chrome/browser/resources/quick_office/manifest.json (right):

https://codereview.chromium.org/15703018/diff/4001/chrome/browser/resources/q...
chrome/browser/resources/quick_office/manifest.json:4: "scripts": [
Does this change require new js/html/nexe? If so, please send them for review
too.

https://codereview.chromium.org/15703018/diff/4001/chrome/browser/resources/q...
chrome/browser/resources/quick_office/manifest.json:62: "version": "2.9.2.14",
Is it still the same version?

[Dmitry Polukhin, 2013-06-13 07:02:22]

LGTM

As we discussed it offline this change should not break existing document
viewer.

[James Hawkins, 2013-06-13 23:24:38]

LGTM

[commit-bot: I haz the power, 2013-06-14 04:04:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dskelton@chromium.org/15703018/4001

[commit-bot: I haz the power, 2013-06-14 05:04:02]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-06-14 06:19:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dskelton@chromium.org/15703018/4001

[commit-bot: I haz the power, 2013-06-14 07:48:15]

Change committed as 206363