When running isolate command through the build tools, have the relative out directories get the same root, so that they all refer to the same location.

BUG=


Review URL: https://chromiumcodereview.appspot.com/12398025

git-svn-id: http://src.chromium.org/svn/trunk/src/build@187305 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

isolate.gypi

@@ -60,16 +60,20 @@
         'python',
         '<(DEPTH)/tools/swarm_client/isolate.py',
         '<(test_isolation_mode)',
-        '--outdir', '<(test_isolation_outdir)',
         '--variable', 'PRODUCT_DIR', '<(PRODUCT_DIR)',
         '--variable', 'OS', '<(OS)',
         '--variable', 'chromeos', '<(chromeos)',
         '--result', '<@(_outputs)',
         '--isolate', '<(RULE_INPUT_PATH)',
-        # Remove once mac compiles are fixed.
-        '-v',
-        '-v',
       ],
+      'conditions': [
+        ["test_isolation_outdir!=''", {
+          'action': [
+            '--outdir', '<(PRODUCT_DIR)/<(test_isolation_outdir)',
+          ],
+        }],
+      ],
+
       'msvs_cygwin_shell': 0,
     },
   ],