Support chrome.windows extension API events for browserless Panels.

chrome/common/chrome_notification_types.h

Index: chrome/common/chrome_notification_types.h
diff --git a/chrome/common/chrome_notification_types.h b/chrome/common/chrome_notification_types.h
index 44deed4060115ca1a5e761c9668fc76a91459b35..fde8346173f16b114855bd41666cf7e7448cf6a1 100644
--- a/chrome/common/chrome_notification_types.h
+++ b/chrome/common/chrome_notification_types.h
@@ -1139,8 +1139,8 @@ enum NotificationType {
   NOTIFICATION_PANEL_BOUNDS_ANIMATIONS_FINISHED,
 
   // Sent when panel gains/loses focus.
-  // The source is the Panel, no details.
-  // Used only in unit testing.
+  // The source is the Panel. Details is a boolean that is true if the
+  // panel is now active.
   NOTIFICATION_PANEL_CHANGED_ACTIVE_STATUS,
 
   // Sent when panel is minimized/restored/shows title only etc.
@@ -1161,6 +1161,10 @@ enum NotificationType {
   // The source is the Panel, no details.
   NOTIFICATION_PANEL_CLOSED,
 
+  // Sent when a panel is opened.
+  // The source is the Panel, no details.
+  NOTIFICATION_PANEL_OPENED,
+
   // Sent when a global error has changed and the error UI should update it
   // self. The source is a Source<Profile> containing the profile for the
   // error. The detail is a GlobalError object that has changed or NULL if