Add support for cros chrome_sdk (simplechrome) to MB.

Add support for cros chrome_sdk (simplechrome) to MB.

When we build Chrome for ChromeOS using the simplechrome
workflow, all of the GYP_DEFINES and gn args that are needed
are determined by the cros wrapper scripts, and rather than
duplicate that logic in the MB mixins, it's easier to just
pass the data through.

However, we don't want this passthrough mechanism to be abused,
so we implement so that this only works if the bot is configured
to allow for passthrough *and* the GYP_DEFINES or GN_ARGS env
vars contain chromeos=1 or target_os="chromeos" as appropriate.

If we need to be less strict later we can alway change things.

R=stevenjb@chromium.org
BUG=605154
Committed: https://crrev.com/73ed0d6aa6f1c9c9a045090574d92493dc12307d
Cr-Commit-Position: refs/heads/master@{#389532}

[Dirk Pranke, 2016-04-23 02:32:54]

Patchset #1 (id:1) has been deleted

[Dirk Pranke, 2016-04-23 02:50:29]

Patchset #1 (id:20001) has been deleted

[stevenjb, 2016-04-25 17:56:00]

This lgtm, but if there is someone else familiar with MB or simple chrome
available to review this, that might be a good idea; my python fu is pretty
minimal.

[Dirk Pranke, 2016-04-25 18:13:38]

I'm not too worried about this; the changes are trivial.

[Dirk Pranke, 2016-04-25 18:13:42]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2016-04-25 18:14:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1913703002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1913703002/40001

[commit-bot: I haz the power, 2016-04-25 19:18:43]

Committed patchset #1 (id:40001)

[commit-bot: I haz the power, 2016-04-25 19:20:23]

Description was changed from

==========
Add support for cros chrome_sdk (simplechrome) to MB.

When we build Chrome for ChromeOS using the simplechrome
workflow, all of the GYP_DEFINES and gn args that are needed
are determined by the cros wrapper scripts, and rather than
duplicate that logic in the MB mixins, it's easier to just
pass the data through.

However, we don't want this passthrough mechanism to be abused,
so we implement so that this only works if the bot is configured
to allow for passthrough *and* the GYP_DEFINES or GN_ARGS env
vars contain chromeos=1 or target_os="chromeos" as appropriate.

If we need to be less strict later we can alway change things.

R=stevenjb@chromium.org
BUG=605154
==========

to

==========
Add support for cros chrome_sdk (simplechrome) to MB.

When we build Chrome for ChromeOS using the simplechrome
workflow, all of the GYP_DEFINES and gn args that are needed
are determined by the cros wrapper scripts, and rather than
duplicate that logic in the MB mixins, it's easier to just
pass the data through.

However, we don't want this passthrough mechanism to be abused,
so we implement so that this only works if the bot is configured
to allow for passthrough *and* the GYP_DEFINES or GN_ARGS env
vars contain chromeos=1 or target_os="chromeos" as appropriate.

If we need to be less strict later we can alway change things.

R=stevenjb@chromium.org
BUG=605154

Committed: https://crrev.com/73ed0d6aa6f1c9c9a045090574d92493dc12307d
Cr-Commit-Position: refs/heads/master@{#389532}
==========

[commit-bot: I haz the power, 2016-04-25 19:20:23]

Patchset 1 (id:??) landed as
https://crrev.com/73ed0d6aa6f1c9c9a045090574d92493dc12307d
Cr-Commit-Position: refs/heads/master@{#389532}