Make sure the google wallet in-app payment support app is always installed.

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_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 142 matching lines @@
 
   // The extension id used for testing streamsPrivate
   extern const char kStreamsPrivateTestExtensionId[];
 
   // The extension id of the Web Store component application.
   extern const char kWebStoreAppId[];
 
   // The extension id of the Youtube application.
   extern const char kYoutubeAppId[];
 
+  // The extension id of the in-app payments support application.
+  extern const char kInAppPaymentsSupportAppId[];
+
   // Note: this structure is an ASN.1 which encodes the algorithm used
   // with its parameters. This is defined in PKCS #1 v2.1 (RFC 3447).
   // It is encoding: { OID sha1WithRSAEncryption      PARAMETERS NULL }
   const uint8 kSignatureAlgorithm[15] = {
     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.
@@ skipping 149 matching lines @@
   // List of sizes for extension icons that can be defined in the manifest.
   extern const int kExtensionActionIconSizes[];
   extern const size_t kNumExtensionActionIconSizes;
 
   // List of sizes for extension icons that can be defined in the manifest.
   extern const int kScriptBadgeIconSizes[];
   extern const size_t kNumScriptBadgeIconSizes;
 }  // namespace extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_