[AppRemoting] Break out AppRemoting shared module (re-land).

[AppRemoting] Break out AppRemoting shared module.

This is a reland of crrev.com/1176143002 with missing files added:
  remoting/webapp/app_remoting/shared_module/manifest.json

This cl breaks out the shared AppRemoting code into a shared module so
that it does not need to be duplicated in each individual app.

This version has the following limitations which will be addressed in
follow-up cls:
(1) The apps have a hard-coded reference to the dev shared module
(2) The apps have a hard-coded reference to the dev orchestrator
(3) The resources in the app stub should be replaced with empty stub
    resources rather than a copy of all the shared resources.
(4) The shared module is only built in GN (not GYP)

BUG=

Committed: https://crrev.com/5b696cf0d943d03a7bd388bdca1ffc6d95d3fc9c
Cr-Commit-Position: refs/heads/master@{#334708}

[garykac, 2015-06-16 19:03:14]

garykac@chromium.org changed reviewers:
+ kelvinp@chromium.org

[garykac, 2015-06-16 19:03:14]

This is identical to the previous cl with the missing files added.

[kelvinp, 2015-06-16 21:00:14]

lgtm

[garykac, 2015-06-16 21:16:31]

The CQ bit was checked by garykac@chromium.org

[commit-bot: I haz the power, 2015-06-16 21:18:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1179873005/20001

[commit-bot: I haz the power, 2015-06-16 21:53:35]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-16 21:54:41]

Patchset 2 (id:??) landed as
https://crrev.com/5b696cf0d943d03a7bd388bdca1ffc6d95d3fc9c
Cr-Commit-Position: refs/heads/master@{#334708}

[Lei Zhang, 2015-06-17 06:15:55]

thestig@chromium.org changed reviewers:
+ thestig@chromium.org

[Lei Zhang, 2015-06-17 06:15:55]

I think this broke the GN build:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20Clobber/buil...
but strangely, the sheriffs did not revert it.

[phoglund_chromium, 2015-06-17 08:42:57]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1191883002/ by phoglund@chromium.org.

The reason for reverting is: I believe this broke the linux GN clobber build:
https://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20Clobber/bui...

Traceback (most recent call last):
  File "../../remoting/webapp/build-webapp.py", line 487, in <module>
    sys.exit(main())
  File "../../remoting/webapp/build-webapp.py", line 483, in main
    return buildWebApp(**vars(args))
  File "../../remoting/webapp/build-webapp.py", line 257, in buildWebApp
    + buildtype + ': ' + service_environment)
Exception: Invalid service_environment targeted for Release: 
ninja: build stopped: subcommand failed..

[phoglund_chromium, 2015-06-17 08:45:28]

On 2015/06/17 06:15:55, Lei Zhang wrote:
> I think this broke the GN build:
>
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20Clobber/buil...
> but strangely, the sheriffs did not revert it.

Lei: I'm trying to revert it now to see if that fixes the problem.