app_shell: Shut down in response to power button.

extensions/shell/app_shell.gyp

Index: extensions/shell/app_shell.gyp
diff --git a/extensions/shell/app_shell.gyp b/extensions/shell/app_shell.gyp
index e904dfe3406a2b9734ce1f8f4226e983dd976adf..8a656f794f4f29bdd2ffadf8763ad8ce8d05a3fc 100644
--- a/extensions/shell/app_shell.gyp
+++ b/extensions/shell/app_shell.gyp
@@ -194,9 +194,11 @@
         '<(DEPTH)/extensions/extensions.gyp:extensions_shell_and_test_pak',
         '<(DEPTH)/extensions/extensions.gyp:extensions_test_support',
         '<(DEPTH)/testing/gtest.gyp:gtest',
+        '<(DEPTH)/ui/aura/aura.gyp:aura_test_support',
       ],
       'sources': [
         '../test/extensions_unittests_main.cc',
+        'browser/shell_desktop_controller_unittest.cc',
         'browser/shell_nacl_browser_delegate_unittest.cc',
       ],
       'conditions': [
@@ -205,6 +207,11 @@
             'browser/shell_nacl_browser_delegate_unittest.cc',
           ],
         }],
+        ['chromeos==1', {
+          'dependencies': [
+            '<(DEPTH)/chromeos/chromeos.gyp:chromeos_test_support_without_gmock',
+          ],
+        }],
       ],
     },
     {