Add new flag for Notification Center features that are not ready yet.

We are planning to use it during the next month while polishing UI for notifications and trying various experiments.

BUG=none

Review URL: https://codereview.chromium.org/69623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234694 0039d316-1c4b-4281-b951-d872f2087c98

chrome/app/generated_resources.grd

@@ -6690,6 +6690,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_ENABLE_RICH_NOTIFICATIONS_DESCRIPTION" desc="Description for the flag to enable rich notifications.">
         Enable rich templated notifications. Both HTML5 notifications and app notifications will be shown through new Notification Center.
       </message>
+      <message name="IDS_FLAGS_ENABLE_EXPERIMENTAL_NOTIFICATION_UI_NAME" desc="Name of the flag to enable experimental UI for notifications.">
+        Enable experimental UI for Notifications
+      </message>
+      <message name="IDS_FLAGS_ENABLE_EXPERIMENTAL_NOTIFICATION_UI_DESCRIPTION" desc="Description for the flag to enable experimental UI for notifications.">
+        Used for various Notification Center features under construction/polish that are not yet ready to be shipped.
+      </message>
       <message name="IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_NAME" desc="Name of the flag to enable synced notifications.">
         Enable Synced Notifications
       </message>

chrome/browser/about_flags.cc

@@ -1358,6 +1358,14 @@ const Experiment kExperiments[] = {
         message_center::switches::kEnableRichNotifications,
         message_center::switches::kDisableRichNotifications)
   },
+  {
+    "enable-experimental-notification-ui",
+    IDS_FLAGS_ENABLE_EXPERIMENTAL_NOTIFICATION_UI_NAME,
+    IDS_FLAGS_ENABLE_EXPERIMENTAL_NOTIFICATION_UI_DESCRIPTION,
+    kOsDesktop,
+    SINGLE_VALUE_TYPE(
+        message_center::switches::kEnableExperimentalNotificationUI)
+  },
   {
     "enable-sync-synced-notifications",
     IDS_FLAGS_ENABLE_SYNCED_NOTIFICATIONS_NAME,

ui/message_center/message_center_switches.cc

@@ -10,5 +10,8 @@ namespace switches {
 const char kDisableRichNotifications[] = "disable-rich-notifications";
 const char kEnableRichNotifications[] = "enable-rich-notifications";
 
+const char kEnableExperimentalNotificationUI[] =
+    "enable-experimental-notification-ui";
+
 }  // namespace switches
 }  // namespace message_center

ui/message_center/message_center_switches.h

@@ -22,6 +22,9 @@ namespace switches {
 MESSAGE_CENTER_EXPORT extern const char kEnableRichNotifications[];
 MESSAGE_CENTER_EXPORT extern const char kDisableRichNotifications[];
 
+// Enables experimental features that we don't want to ship yet.
+MESSAGE_CENTER_EXPORT extern const char kEnableExperimentalNotificationUI[];
+
 }  // namespace switches
 }  // namespace message_center
 

ui/message_center/message_center_util.cc

@@ -31,4 +31,9 @@ bool IsRichNotificationEnabled() {
   return true;
 }
 
+bool IsExperimentalNotificationUIEnabled() {
+  return CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableExperimentalNotificationUI);
+}
+
 }  // namespace message_center

ui/message_center/message_center_util.h

@@ -17,6 +17,8 @@ MESSAGE_CENTER_EXPORT bool IsRichNotificationEnabled();
 #define RUN_MESSAGE_CENTER_TESTS 1
 #endif
 
+MESSAGE_CENTER_EXPORT bool IsExperimentalNotificationUIEnabled();
+
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_UTIL_H_