Run app_shell_browsertests and app_shell_unittests on mac trybots and waterfall bots.

testing/buildbot/chromium_trybot.json

Index: testing/buildbot/chromium_trybot.json
diff --git a/testing/buildbot/chromium_trybot.json b/testing/buildbot/chromium_trybot.json
index edfcad23fba91a0e0db6e01daaf277711bb318e1..e8bf5816b46cc4e9278fb508a8025739e65e0d64 100644
--- a/testing/buildbot/chromium_trybot.json
+++ b/testing/buildbot/chromium_trybot.json
@@ -19,6 +19,8 @@
         "can_use_on_swarming_builders": true
       }
     },
+    "app_shell_browsertests",
+    "app_shell_unittests",
     {
       "test": "ash_unittests",
       "chromium_configs": [
@@ -216,14 +218,6 @@
       "platforms": ["linux", "win"]
     },
     {
-      "test": "app_shell_browsertests",
-      "platforms": ["linux", "win"]
-    },
-    {
-      "test": "app_shell_unittests",
-      "platforms": ["linux", "win"]
-    },
-    {
       "test": "aura_unittests",
       "platforms": ["linux", "win"]
     },