Add app_list_unittests to the CQ steps on mac, windows and linux_aura.

projects.py

Index: projects.py
===================================================================
--- projects.py	(revision 228624)
+++ projects.py	(working copy)
@@ -304,6 +304,7 @@
     # the corresponding *_rel builders.
     # Note: *_aura are Release builders even if their names convey otherwise.
     aura_tests = [
+      'app_list_unittests',
       'aura_unittests',
       'browser_tests',
       'compositor_unittests',
@@ -362,6 +363,7 @@
       ],
       'mac': ['compile'],
       'mac_rel': standard_tests + [
+        'app_list_unittests',
         'cc_unittests',
         'chromedriver2_unittests',
         'components_unittests',
@@ -376,6 +378,7 @@
         'ash_unittests',
       ],
       'win_rel': standard_tests + [
+        'app_list_unittests',
         'cc_unittests',
         'chrome_frame_net_tests',
         'chrome_frame_tests',