Run app_shell_browsertests and app_shell_unittests on mac trybots and waterfall bots.

testing/buildbot/chromium_trybot.json

 {
   "compile_targets": [
     "all"
   ],
   "gtest_tests": [
     {
       "test": "accessibility_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
       }
     },
     {
       "test": "app_installer_unittests",
       "platforms": ["win"]
     },
     {
       "test": "app_list_unittests",
       "swarming": {
         "can_use_on_swarming_builders": true
       }
     },
+    "app_shell_browsertests",
+    "app_shell_unittests",
     {
       "test": "ash_unittests",
       "chromium_configs": [
         "chromium_chromeos",
         "chromium_chromeos_clang",
         "chromium_chromeos_ozone"
       ],
       "swarming": {
         "can_use_on_swarming_builders": true
       }
@@ skipping 177 matching lines @@
         "chromium_chromeos_clang",
         "chromium_chromeos_ozone"
       ]
     },
     "url_unittests",
     {
       "test": "wm_unittests",
       "platforms": ["linux", "win"]
     },
     {
-      "test": "app_shell_browsertests",
-      "platforms": ["linux", "win"]
-    },
-    {
-      "test": "app_shell_unittests",
-      "platforms": ["linux", "win"]
-    },
-    {
       "test": "aura_unittests",
       "platforms": ["linux", "win"]
     },
     {
       "test": "views_unittests",
       "platforms": ["linux", "win"]
     },
     {
       "test": "sandbox_linux_unittests",
       "platforms": ["linux"],
@@ skipping 38 matching lines @@
   "non_filter_tests_builders": [
   ],
 
   "filter_compile_builders": [
     "win_chromium_compile_dbg",
     "win_chromium_rel_swarming",
     "win_chromium_x64_rel_swarming",
     "win8_chromium_rel"
   ]
 }