Add a help bubble pointing to the omnibox when installing an extension with

chrome/browser/gtk/extension_installed_bubble_gtk.h

Index: chrome/browser/gtk/extension_installed_bubble_gtk.h
diff --git a/chrome/browser/gtk/extension_installed_bubble_gtk.h b/chrome/browser/gtk/extension_installed_bubble_gtk.h
index 08d6feca48d3ec1ae19aa11ba1cd3e623a333db4..06132836f6fe4653c1905ca3a081ea1ee5cf6f9d 100644
--- a/chrome/browser/gtk/extension_installed_bubble_gtk.h
+++ b/chrome/browser/gtk/extension_installed_bubble_gtk.h
@@ -22,6 +22,7 @@ class SkBitmap;
 // Provides feedback to the user upon successful installation of an
 // extension. Depending on the type of extension, the InfoBubble will
 // point to:
+//    OMNIBOX_KEYWORD-> The omnibox.
 //    BROWSER_ACTION -> The browserAction icon in the toolbar.
 //    PAGE_ACTION    -> A preview of the page action icon in the location
 //                      bar which is shown while the InfoBubble is shown.
@@ -36,6 +37,7 @@ class ExtensionInstalledBubbleGtk
  public:
   // The behavior and content of this InfoBubble comes in three varieties.
   enum BubbleType {
+    OMNIBOX_KEYWORD,
     BROWSER_ACTION,
     PAGE_ACTION,
     GENERIC