Update notification style: allow 2-line titles if the message is blank.

ui/message_center/views/notification_view.cc

Index: ui/message_center/views/notification_view.cc
diff --git a/ui/message_center/views/notification_view.cc b/ui/message_center/views/notification_view.cc
index 10573eddc8382bc63da327d72fa731f8073bd990..8157e181c92fdecf6f16e462d5de378a2ad5e127 100644
--- a/ui/message_center/views/notification_view.cc
+++ b/ui/message_center/views/notification_view.cc
@@ -323,11 +323,15 @@ NotificationView::NotificationView(MessageCenterController* controller,
     const gfx::FontList& font_list =
         default_label_font_list.DeriveWithSizeDelta(2);
     int padding = kTitleLineHeight - font_list.GetHeight();
+    int title_lines = notification.message().empty() ? kTitleNoMessageLineLimit
+                                                     : kTitleLineLimit;
+    int title_character_limit =
+        kNotificationWidth * title_lines / kMinPixelsPerTitleCharacter;
     title_view_ = new BoundedLabel(
-        gfx::TruncateString(notification.title(), kTitleCharacterLimit),
+        gfx::TruncateString(notification.title(), title_character_limit),
         font_list);
     title_view_->SetLineHeight(kTitleLineHeight);
-    title_view_->SetLineLimit(message_center::kTitleLineLimit);
+    title_view_->SetLineLimit(title_lines);
     title_view_->SetColors(message_center::kRegularTextColor,
                            kRegularTextBackgroundColor);
     title_view_->SetBorder(MakeTextBorder(padding, 3, 0));