Support creating progress bar notification for Windows

chrome/common/extensions/api/notifications.idl

Index: chrome/common/extensions/api/notifications.idl
diff --git a/chrome/common/extensions/api/notifications.idl b/chrome/common/extensions/api/notifications.idl
index 321cd5c0a13add5dc25c4e724aba7870c4e91c2b..5e24848e1187d8ef5bba01e38b531968efea09e9 100644
--- a/chrome/common/extensions/api/notifications.idl
+++ b/chrome/common/extensions/api/notifications.idl
@@ -13,7 +13,10 @@ namespace notifications {
     image,
 
     // icon, title, message, items, up to two buttons
-    list
+    list,
+
+    // icon, title, message, progress, up to two buttons
+    progress
   };
 
   dictionary NotificationItem {
@@ -70,6 +73,9 @@ namespace notifications {
 
     // Items for multi-item notifications.
     NotificationItem[]? items;
+
+    // Current progress ranges from 0 to 100.
+    long? progress;
   };
 
   callback CreateCallback = void (DOMString notificationId);