Experimental USB API

chrome/common/extensions/extension_permission_set.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_permission_set.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 244 matching lines @@
       kTopSites, "topSites", IDS_EXTENSION_PROMPT_WARNING_BROWSING_HISTORY,
       ExtensionPermissionMessage::kBrowsingHistory, kFlagNone);
   info->RegisterPermission(
       kTts, "tts", 0,
       ExtensionPermissionMessage::kNone, kFlagCannotBeOptional);
   info->RegisterPermission(
       kTtsEngine, "ttsEngine", IDS_EXTENSION_PROMPT_WARNING_TTS_ENGINE,
       ExtensionPermissionMessage::kTtsEngine,
       kFlagCannotBeOptional);
   info->RegisterPermission(
+      kUsb, "usb", IDS_EXTENSION_PROMPT_WARNING_USB,
+      ExtensionPermissionMessage::kNone, kFlagNone);

[Evan Stade, 2012/06/12 18:09:48]

why is this ExtensionPermissionMessage::kNone?

+  info->RegisterPermission(
       kWebNavigation, "webNavigation",
       IDS_EXTENSION_PROMPT_WARNING_TABS, ExtensionPermissionMessage::kTabs,
       kFlagNone);
   info->RegisterPermission(
       kWebRequest, "webRequest", 0, ExtensionPermissionMessage::kNone,
       kFlagNone);
   info->RegisterPermission(
       kWebRequestBlocking, "webRequestBlocking", 0,
       ExtensionPermissionMessage::kNone, kFlagNone);
 
@@ skipping 675 matching lines @@
   ExtensionOAuth2Scopes current_scopes = scopes();
   ExtensionOAuth2Scopes new_scopes = permissions->scopes();
   ExtensionOAuth2Scopes delta_scopes;
   std::set_difference(new_scopes.begin(), new_scopes.end(),
                       current_scopes.begin(), current_scopes.end(),
                       std::inserter(delta_scopes, delta_scopes.begin()));
 
   // We have less privileges if there are additional scopes present.
   return !delta_scopes.empty();
 }