Support DEVELOPER_DIR in gyp-ninja for mac.

Support DEVELOPER_DIR in gyp-ninja for mac.

Adds DEVELOPER_DIR to gyp mac_tool.py, to LINK commands in ninja
and to the default Xcode emulation environment.

BUG=
R=sdefresne@chromium.org

Committed: https://chromium.googlesource.com/external/gyp/+/28340b46df65f2c84f7793470189a0b395e1c9a4

[justincohen, 2016-03-15 19:29:08]

Description was changed from

==========
Support developer dir in gyp-ninja for mac.

BUG=
==========

to

==========
Support DEVELOPER_DIR in gyp-ninja for mac.

BUG=
==========

[justincohen, 2016-03-23 17:14:34]

Description was changed from

==========
Support DEVELOPER_DIR in gyp-ninja for mac.

BUG=
==========

to

==========
Support DEVELOPER_DIR in gyp-ninja for mac.

Adds DEVELOPER_DIR to gyp mac_tool.py, to LINK commands in ninja
and to the default Xcode emulation environment.

BUG=
==========

[justincohen, 2016-03-23 17:15:05]

justincohen@chromium.org changed reviewers:
+ sdefresne@chromium.org, thakis@chromium.org

[justincohen, 2016-03-23 17:15:05]

I wonder if there's a better way to do this?

[sdefresne, 2016-03-25 17:25:12]

lgtm but if possible I'd like to reduce the usage of environment variables in
gyp_mac_tool.py as this prevent sharing the tool with gn (as it is difficult to
pass environment variables to a script in an "action" target).

[justincohen, 2016-03-26 20:54:48]

I changed this CL to use generator flags, but it still embeds
os.environ['DEVELOPER_DIR'] in mac gyp tool since there's a number of xcrun
calls within that script.

[justincohen, 2016-03-26 21:48:51]

Description was changed from

==========
Support DEVELOPER_DIR in gyp-ninja for mac.

Adds DEVELOPER_DIR to gyp mac_tool.py, to LINK commands in ninja
and to the default Xcode emulation environment.

BUG=
==========

to

==========
Support DEVELOPER_DIR in gyp-ninja for mac.

Adds DEVELOPER_DIR to gyp mac_tool.py, to LINK commands in ninja
and to the default Xcode emulation environment.

BUG=
R=sdefresne@chromium.org

Committed:
https://chromium.googlesource.com/external/gyp/+/28340b46df65f2c84f7793470189...
==========

[justincohen, 2016-03-26 21:48:52]

Committed patchset #4 (id:60001) manually as
28340b46df65f2c84f7793470189a0b395e1c9a4 (presubmit successful).