[Chromoting] Add remoting_options.gypi to share vars.

[Chromoting] Add remoting_options.gypi to share vars.

Default vars (like run_jscompile) should only be defined in one place.
This cl adds remoting_options.gypi so that the variables can be used
by both DesktopRemoting and AppRemoting gyp files.

BUG=

Committed: https://crrev.com/ff9e4bf4c19b2ae13af4b200ddad52f54c46009e
Cr-Commit-Position: refs/heads/master@{#318838}

[garykac, 2015-03-03 01:09:27]

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

[Jamie, 2015-03-03 01:15:48]

lgtm

[garykac, 2015-03-03 01:43:09]

The CQ bit was checked by garykac@chromium.org

[commit-bot: I haz the power, 2015-03-03 01:52:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/974673002/1

[commit-bot: I haz the power, 2015-03-03 04:04:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-03 04:05:37]

Patchset 1 (id:??) landed as
https://crrev.com/ff9e4bf4c19b2ae13af4b200ddad52f54c46009e
Cr-Commit-Position: refs/heads/master@{#318838}