Add a flag that lets the webstore show a different UI on app install.

chrome/common/chrome_switches.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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
@@ skipping 14 matching lines @@
 // alongside the definition of their values in the .cc file.
 extern const char kAllowCrossOriginAuthPrompt[];
 extern const char kAllowFileAccess[];
 extern const char kAllowOutdatedPlugins[];
 extern const char kAllowHTTPBackgroundPage[];
 extern const char kAllowScriptingGallery[];
 extern const char kAllowWebSocketProxy[];
 extern const char kAllowWebUICompositing[];
 extern const char kAllowWebUIOobe[];
 extern const char kAlwaysAuthorizePlugins[];
+extern const char kAppId[];
 extern const char kApp[];
-extern const char kAppId[];
 extern const char kAppsCheckoutURL[];
 extern const char kAppsGalleryReturnTokens[];
 extern const char kAppsGalleryURL[];
 extern const char kAppsGalleryUpdateURL[];
+extern const char kAppsNewInstallBubble[];
 extern const char kAppsNoThrob[];
 extern const char kAuthNegotiateDelegateWhitelist[];
 extern const char kAuthSchemes[];
 extern const char kAuthServerWhitelist[];
 extern const char kAutomationClientChannelID[];
 extern const char kBlockReadingThirdPartyCookies[];
 extern const char kBrowserAssertTest[];
 extern const char kBrowserCrashTest[];
 extern const char kCheckForUpdateIntervalSec[];
 extern const char kChromeVersion[];
@@ skipping 318 matching lines @@
 bool IsPrintPreviewEnabled();
 
 bool IsInBrowserThumbnailingEnabled();
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_