Added padding below text in notifications.

ui/message_center/cocoa/notification_controller.mm

Index: ui/message_center/cocoa/notification_controller.mm
diff --git a/ui/message_center/cocoa/notification_controller.mm b/ui/message_center/cocoa/notification_controller.mm
index 3eda7e056ef9f4226c0d64d675db5cc7cb39e90c..615e44a06d92018db1d969a1aabe74b98283b255 100644
--- a/ui/message_center/cocoa/notification_controller.mm
+++ b/ui/message_center/cocoa/notification_controller.mm
@@ -79,8 +79,8 @@
 
   // In this basic notification UI, the message body is the bottom-most
   // vertical element. If it is out of the rootView's bounds, resize the view.
-  if (NSMinY([message_ frame]) < message_center::kTextTopPadding) {
-    rootFrame.size.height += message_center::kTextTopPadding -
+  if (NSMinY([message_ frame]) < message_center::kTextTopPadding - 6) {
+    rootFrame.size.height += message_center::kTextTopPadding - 6 -
         NSMinY([message_ frame]);
   }
 
@@ -159,7 +159,8 @@
   CGFloat delta =
       [GTMUILocalizerAndLayoutTweaker sizeToFitFixedWidthTextField:title_];
   frame.size.height = delta;
-  frame.origin.y = NSMaxY(rootFrame) - message_center::kTextTopPadding - delta;
+  frame.origin.y = NSMaxY(rootFrame) - message_center::kTextTopPadding - 6 -
+                   delta;
   [title_ setFrame:frame];
 }
 
@@ -175,7 +176,7 @@
   CGFloat delta =
       [GTMUILocalizerAndLayoutTweaker sizeToFitFixedWidthTextField:message_];
   frame.size.height = delta;
-  frame.origin.y = maxY - message_center::kTextTopPadding - delta;
+  frame.origin.y = maxY - message_center::kTextTopPadding - 6 - delta;
   [message_ setFrame:frame];
 }