Skip running GYP if GYP_CHROMIUM_NO_ACTION is set in environment

Skip running GYP if GYP_CHROMIUM_NO_ACTION is set in environment

This is how GYP is skipped on the GN bots. If GYP runs, it will currently
produce files in out/{Debug,Releaese} that makes GN fail.

BUG=601140
TBR=fbarchard@chromium.org

Committed: https://chromium.googlesource.com/libyuv/libyuv/+/870d9b513bf7bb2c8c29d907657e1a826291c49a

[kjellander_chromium, 2016-04-08 12:01:10]

Example failure:
https://uberchromegw.corp.google.com/i/tryserver.libyuv/builders/android_gn/b...

Notice that GYP_CHROMIUM_NO_ACTION is set in the environment for the gclient
runhooks step.

[kjellander_chromium, 2016-04-08 12:01:45]

Description was changed from

==========
Skip running GYP if GYP_CHROMIUM_NO_ACTION is set in environment

This is how GYP is skipped on the GN bots. If GYP runs, it will currently
produce files in out/{Debug,Releaese} that makes GN fail.

BUG=601140
TBR=fbarchard@chromium.org
==========

to

==========
Skip running GYP if GYP_CHROMIUM_NO_ACTION is set in environment

This is how GYP is skipped on the GN bots. If GYP runs, it will currently
produce files in out/{Debug,Releaese} that makes GN fail.

BUG=601140
TBR=fbarchard@chromium.org

Committed:
https://chromium.googlesource.com/libyuv/libyuv/+/870d9b513bf7bb2c8c29d907657...
==========

[kjellander_chromium, 2016-04-08 12:01:46]

Committed patchset #1 (id:1) manually as
870d9b513bf7bb2c8c29d907657e1a826291c49a (presubmit successful).

[fbarchard1, 2016-04-08 18:12:35]

fbarchard@google.com changed reviewers:
+ fbarchard@google.com

[fbarchard1, 2016-04-08 18:12:36]

rubberstamp lgtm

[fbarchard1, 2016-04-08 18:12:52]

lgtm