Record omnibox app launches in AppLaunch histogram.

chrome/common/extensions/extension_constants.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 
@@ skipping 329 matching lines @@
 
     // Nvigated to an app from within a web page (like by clicking a link).
     APP_LAUNCH_CONTENT_NAVIGATION,
 
     // Launch from session restore.
     APP_LAUNCH_SESSION_RESTORE,
 
     // Autolaunched at startup, like for pinned tabs.
     APP_LAUNCH_AUTOLAUNCH,
 
-    // Launched from omnibox app links (not implemented yet).
+    // Launched from omnibox app links.
     APP_LAUNCH_OMNIBOX_APP,
 
     // App URL typed directly into the omnibox (w/ instant turned off).
     APP_LAUNCH_OMNIBOX_LOCATION,
 
     // Navigate to an app URL via instant.
     APP_LAUNCH_OMNIBOX_INSTANT,
 
     // Launch via chrome.management.launchApp.
     APP_LAUNCH_EXTENSION_API,
@@ skipping 31 matching lines @@
     INSTALL_CAUSE_UNSET = 0,
     INSTALL_CAUSE_USER_DOWNLOAD,
     INSTALL_CAUSE_UPDATE,
     INSTALL_CAUSE_EXTERNAL_FILE,
     INSTALL_CAUSE_AUTOMATION,
     NUM_INSTALL_CAUSES
   };
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_