Implement chrome.systemPrivate.getIncognitoModeAvailability extension API function

chrome/browser/extensions/extension_preference_api.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_preference_api.h"
 
 #include <map>
 
 #include "base/json/json_writer.h"
 #include "base/memory/singleton.h"
@@ skipping 11 matching lines @@
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "chrome/common/extensions/extension_permission_set.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 
 namespace {
 
 struct PrefMappingEntry {
+  // Name of the preference referenced by extension_api.json.
   const char* extension_pref;
+
+  // Name of the preference in the PrefStores.
   const char* browser_pref;
+
+  // Permission required to access this preference.
+  // Use ExtensionAPIPermission::kInvalid for |permission| to express that no
+  // permission is necessary.
   ExtensionAPIPermission::ID permission;
 };
 
 const char kNotControllable[] = "not_controllable";
 const char kControlledByOtherExtensions[] = "controlled_by_other_extensions";
 const char kControllableByThisExtension[] = "controllable_by_this_extension";
 const char kControlledByThisExtension[] = "controlled_by_this_extension";
 
 const char kIncognitoSpecific[] = "incognitoSpecific";
 const char kLevelOfControl[] = "levelOfControl";
@@ skipping 460 matching lines @@
           pref_key, &browser_pref, &permission));
   if (!GetExtension()->HasAPIPermission(permission)) {
     error_ = ExtensionErrorUtils::FormatErrorMessage(
         keys::kPermissionErrorMessage, pref_key);
     return false;
   }
   ExtensionPrefs* prefs = profile_->GetExtensionService()->extension_prefs();
   prefs->RemoveExtensionControlledPref(extension_id(), browser_pref, scope);
   return true;
 }