Add a new gyp define to be used by the swarm master.

Rename tests_run to test_isolation_mode.

TBR=mad@chromium.org
BUG=98636
TEST=
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/10392073

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137127 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 0ef3a52b5467e3eb07d0f6b7fb59ee9c6a775015
diff --git a/base/base.gyp b/base/base.gyp
index 6f403fc..7b4f970 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -491,7 +491,8 @@
           'action': [
             'python',
             '../tools/isolate/isolate.py',
-            '--mode', '<(tests_run)',
+            '--mode', '<(test_isolation_mode)',
+            '--outdir', '<(test_isolation_outdir)',
             '--variable', 'PRODUCT_DIR', '<(PRODUCT_DIR)',
             '--variable', 'OS', '<(OS)',
             '--result', '<@(_outputs)',