Extend notifications.mojom for expandable notifications.

ui/arc/notification/arc_custom_notification_item.cc

Index: ui/arc/notification/arc_custom_notification_item.cc
diff --git a/ui/arc/notification/arc_custom_notification_item.cc b/ui/arc/notification/arc_custom_notification_item.cc
index f44884dd5c039ad80cf19ab073be0df5c6b3e581..ce9a05058d9e2c0ea0765bb8c2d431a4f91960d5 100644
--- a/ui/arc/notification/arc_custom_notification_item.cc
+++ b/ui/arc/notification/arc_custom_notification_item.cc
@@ -50,6 +50,23 @@ class ArcNotificationDelegate : public message_center::NotificationDelegate {
   DISALLOW_COPY_AND_ASSIGN(ArcNotificationDelegate);
 };
 
+message_center::NotificationExpandState ToNotificationExpandState(

[yoshiki, 2017/03/24 10:47:27]

I think it's enough to use the mojo enum values
(mojom::ArcNotificationExpandState) directly than converting values from mojo to
chrome (messagece_center::NotificationExpandState). We already use mojo values
directly at many places in ui/arc.

If you want to having conversion, we should write typemaps and converter (see.
components/arc/bluetooth/bluetooth_type_converters.cc for example).

+    mojom::ArcNotificationExpandState state) {
+  switch (state) {
+    case mojom::ArcNotificationExpandState::FIXED_SIZE:
+      return message_center::NotificationExpandState::FIXED_SIZE;
+    case mojom::ArcNotificationExpandState::COLLAPSED:
+      return message_center::NotificationExpandState::COLLAPSED;
+    case mojom::ArcNotificationExpandState::EXPANDED:
+      return message_center::NotificationExpandState::EXPANDED;
+    default:
+      NOTREACHED();
+      break;
+  }
+  NOTREACHED();
+  return message_center::NotificationExpandState::FIXED_SIZE;
+}
+
 }  // namespace
 
 ArcCustomNotificationItem::ArcCustomNotificationItem(
@@ -80,6 +97,7 @@ void ArcCustomNotificationItem::UpdateWithArcNotificationData(
 
   message_center::RichNotificationData rich_data;
   rich_data.pinned = (data->no_clear || data->ongoing_event);
+  rich_data.expand_state = ToNotificationExpandState(data->expand_state);
   rich_data.priority = ConvertAndroidPriority(data->priority);
   if (data->small_icon)
     rich_data.small_image = gfx::Image::CreateFrom1xBitmap(*data->small_icon);
@@ -101,6 +119,7 @@ void ArcCustomNotificationItem::UpdateWithArcNotificationData(
   SetNotification(std::move(notification));
 
   pinned_ = rich_data.pinned;
+  expand_state_ = rich_data.expand_state;
 
   if (!data->snapshot_image || data->snapshot_image->isNull()) {
     snapshot_ = gfx::ImageSkia();