Exempt component and policy-installed extensions from policy blacklist check.

chrome/browser/extensions/extension_prefs.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_prefs.h"
 
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_pref_store.h"
 #include "chrome/browser/prefs/pref_notifier.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/url_constants.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
 #include "content/public/browser/notification_service.h"
 
 using base::Time;
 
 namespace {
 
 // The number of apps per page. This isn't a hard limit, but new apps installed
 // from the webstore will overflow onto a new page if this limit is reached.
 const int kNaturalAppPageSize = 18;
 
@@ skipping 552 matching lines @@
 
 bool ExtensionPrefs::SetAlertSystemFirstRun() {
   if (prefs_->GetBoolean(prefs::kExtensionAlertsInitializedPref)) {
     return true;
   }
   prefs_->SetBoolean(prefs::kExtensionAlertsInitializedPref, true);
   return false;
 }
 
 bool ExtensionPrefs::IsExtensionAllowedByPolicy(
-    const std::string& extension_id) {
+    const std::string& extension_id,
+    Extension::Location location) {
   std::string string_value;
 
+  if (location == Extension::COMPONENT ||
+      location == Extension::EXTERNAL_POLICY_DOWNLOAD) {
+    return true;
+  }
+
   const ListValue* blacklist =
       prefs_->GetList(prefs::kExtensionInstallDenyList);
   if (!blacklist || blacklist->empty())
     return true;
 
   // Check the whitelist first.
   const ListValue* whitelist =
       prefs_->GetList(prefs::kExtensionInstallAllowList);
   if (whitelist) {
     for (ListValue::const_iterator it = whitelist->begin();
@@ skipping 1189 matching lines @@
   prefs->RegisterListPref(prefs::kExtensionInstallAllowList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kExtensionInstallDenyList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kExtensionInstallForceList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterStringPref(kWebStoreLogin,
                             std::string() /* default_value */,
                             PrefService::UNSYNCABLE_PREF);
 }