Add an API for hosted apps to check their install and running states.

chrome/common/extensions/extension_constants.cc

 // 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.
 
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 94 matching lines @@
 const char kCroshBuiltinAppId[] = "nkoccljplnhpfnfiajclkommnmllphnl";
 const char kWebStoreAppId[] = "ahfgeienlihckogmohjhadlkjgocpleb";
 const char kCloudPrintAppId[] = "mfehgcgbbipciphmccgaenjidiccnmng";
 const char kAppsPromoHistogram[] = "Extensions.AppsPromo";
 const char kAppLaunchHistogram[] = "Extensions.AppLaunch";
 #if defined(OS_CHROMEOS)
 const char kAccessExtensionPath[] =
     "/usr/share/chromeos-assets/accessibility/extensions";
 const char kChromeVoxDirectoryName[] = "access_chromevox";
 #endif
+
+const char kAppStateNotInstalled[] = "not_installed";
+const char kAppStateInstalled[] = "installed";
+const char kAppStateDisabled[] = "disabled";
+const char kAppStateRunning[] = "running";
+const char kAppStateCannotRun[] = "cannot_run";
+const char kAppStateReadyToRun[] = "ready_to_run";
+
 const char kAppNotificationsIncognitoError[] =
     "This API is not accessible by 'split' mode "
     "extensions in incognito windows.";
 }