Switch platform apps from a declarative launch container to handling an onLaunched event.

chrome/common/extensions/extension_constants.h

 // Copyright (c) 2012 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 <string>
 
@@ skipping 107 matching lines @@
     0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
     0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00
   };
 
   // Don't remove items or change the order of this enum.  It's used in
   // histograms and preferences.
   enum LaunchContainer {
     LAUNCH_WINDOW,
     LAUNCH_PANEL,
     LAUNCH_TAB,
-    LAUNCH_SHELL
+    // For platform apps, which don't actually have a container (they just get a
+    // "onLaunched" event).
+    LAUNCH_NONE
   };
 
   // The name of the apps promo histogram.
   extern const char kAppsPromoHistogram[];
 
   // The buckets used in the apps promo histogram.
   enum AppsPromoBuckets {
     PROMO_LAUNCH_APP,
     PROMO_LAUNCH_WEB_STORE,
     PROMO_CLOSE,
@@ skipping 97 matching lines @@
     UNLOAD_REASON_UNINSTALL,  // Extension is being uninstalled.
     UNLOAD_REASON_TERMINATE,  // Extension has terminated.
   };
 
   // Error indicating that the app notifications API is not accessible by split
   // mode extensions in incognito windows.
   extern const char kAppNotificationsIncognitoError[];
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_