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

chrome/browser/extensions/external_provider_impl.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/browser/extensions/external_provider_impl.h"
 
 #include <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/external_component_loader.h"
 #include "chrome/browser/extensions/external_policy_loader.h"
 #include "chrome/browser/extensions/external_pref_loader.h"
 #include "chrome/browser/extensions/external_provider_interface.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/manifest.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 419 matching lines @@
           linked_ptr<ExternalProviderInterface>(
             new ExternalProviderImpl(
                 service,
                 connector->GetAppPackUpdater()->CreateExternalLoader(),
                 Manifest::EXTERNAL_PREF,
                 Manifest::INVALID_LOCATION,
                 Extension::NO_FLAGS)));
     }
 #endif
   }
+
+  provider_list->push_back(

[Dmitry Polukhin, 2013/08/14 19:39:12]

FYI, I'm going to move this provider under "if (!is_managed_profile)" because
Chrome OS supervised user don't have GAIA and there is no sense to install this
app for them (all other default apps are excluded for supervised users). Please
let me know if you have any concerns.

+      linked_ptr<ExternalProviderInterface>(
+        new ExternalProviderImpl(
+            service,
+            new ExternalComponentLoader(),
+            Manifest::INVALID_LOCATION,
+            Manifest::EXTERNAL_POLICY_DOWNLOAD,

[Mattias Nissler (ping if slow), 2013/09/05 08:19:06]

Is the EXTERNAL_POLICY_DOWNLOAD location intentional here? That may trigger
various policy-specific extension restrictions and messaging, which may not be
appropriate for the payment app.

[asargent_no_longer_on_chrome, 2013/09/05 21:19:16]

Whether it was intentional or not, it is incorrect as you point out (also it
messes up our UMA metrics). I've opened crbug.com/285983 to fix it. 

+            Extension::FROM_WEBSTORE | Extension::WAS_INSTALLED_BY_DEFAULT)));
 }
 
 }  // namespace extensions