Add more conditions where test_isolation_mode defaults to noop.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 0fe8b73a27892551156cd5ee253a5398b17a5165..d39128b1e23488a54a4aa840dd5caf5af1b20df6 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -624,12 +624,17 @@
         }],
 
         # Whether tests targets should be run, archived or just have the
-        # dependencies verified. All the tests targets have the '_run' suffix,  
+        # dependencies verified. All the tests targets have the '_run' suffix,
         # e.g. base_unittests_run runs the target base_unittests. The test
         # target always calls tools/swarm_client/isolate.py. See the script's
         # --help for more information and the valid --mode values. Meant to be
         # overriden with GYP_DEFINES.
-        ['inside_chromium_build==1 and OS != "ios" and OS != "android"', {
+        # TODO(maruel): Remove the conditions as more configurations are
+        # supported.
+        # NOTE: The check for disable_nacl==0 and component=="static_library"
+        # can't be used here because these variables are not defined yet, but it
+        # is still not supported.
+        ['inside_chromium_build==1 and OS!="ios" and OS!="android" and chromeos==0', {
           'test_isolation_mode%': 'check',
         }, {
           'test_isolation_mode%': 'noop',