Store USB device permissions in website settings.

components/content_settings/core/browser/content_settings_registry.cc

 // Copyright 2015 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 "components/content_settings/core/browser/content_settings_registry.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "components/content_settings/core/browser/content_settings_utils.h"
@@ skipping 138 matching lines @@
            CONTENT_SETTING_ASK, WebsiteSettingsInfo::SYNCABLE,
            NoWhitelistedSchemes());
 #if defined(OS_ANDROID) || defined(OS_CHROMEOS)
   Register(CONTENT_SETTINGS_TYPE_PROTECTED_MEDIA_IDENTIFIER,
            "protected-media-identifier", CONTENT_SETTING_ASK,
            WebsiteSettingsInfo::UNSYNCABLE, NoWhitelistedSchemes());
 #endif
   Register(CONTENT_SETTINGS_TYPE_DURABLE_STORAGE, "durable-storage",
            CONTENT_SETTING_ASK, WebsiteSettingsInfo::UNSYNCABLE,
            NoWhitelistedSchemes());
+  // Register(CONTENT_SETTINGS_TYPE_USB, "usb",

[raymes, 2015/10/06 05:28:20]

I'd suggest naming this one "USB" and the website setting "USB_CHOOSER_DATA" or
something like that (establish a pattern for future devs and hopefully we can
write code to automate some of this later :)

[Reilly Grant (use Gerrit), 2015/10/06 20:45:30]

Okay. I think this will also resolve mlamouri@'s concerns about extending
PermissionContextBase. If I make ChooserPermissionContextBase the root of its
own class hierarchy then I can require that each chooser permission also
references a boolean content setting.

+  //         CONTENT_SETTING_ALLOW, WebsiteSettingsInfo::UNSYNCABLE,
+  //         NoWhitelistedSchemes());
 
   // Content settings that aren't used to store any data. TODO(raymes): use a
   // different mechanism rather than content settings to represent these.
   // Since nothing is stored in them, there is no real point in them being a
   // content setting.
   Register(CONTENT_SETTINGS_TYPE_PROTOCOL_HANDLERS, "protocol-handler",
            CONTENT_SETTING_DEFAULT, WebsiteSettingsInfo::UNSYNCABLE,
            NoWhitelistedSchemes());
   Register(CONTENT_SETTINGS_TYPE_MIXEDSCRIPT, "mixed-script",
            CONTENT_SETTING_DEFAULT, WebsiteSettingsInfo::UNSYNCABLE,
@@ skipping 19 matching lines @@
       website_settings_registry_->Register(type, name, default_value.Pass(),
                                            sync_status,
                                            WebsiteSettingsInfo::NOT_LOSSY);
   DCHECK(!ContainsKey(content_settings_info_, type));
   content_settings_info_.set(
       type, make_scoped_ptr(new ContentSettingsInfo(website_settings_info,
                                                     whitelisted_schemes)));
 }
 
 }  // namespace content_settings