Store USB device permissions in website settings.

chrome/browser/permissions/chooser_context.h

Index: chrome/browser/permissions/chooser_context.h
diff --git a/chrome/browser/permissions/chooser_context.h b/chrome/browser/permissions/chooser_context.h
new file mode 100644
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+++ b/chrome/browser/permissions/chooser_context.h
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+// 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.
+
+#ifndef CHROME_BROWSER_PERMISSIONS_CHOOSER_CONTEXT_H_
+#define CHROME_BROWSER_PERMISSIONS_CHOOSER_CONTEXT_H_
+
+#include <list>
+
+#include "base/macros.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+
+class ChooserContextBase;
+enum class ChooserType;
+class Profile;
+class KeyedServiceBaseFactory;
+
+class ChooserContext {
+ public:
+  // Helper method returning the ChooserContextBase object associated with the
+  // given ContentSettingsType. This can return nullptr if the the permission
+  // type has no associated context.
+  static ChooserContextBase* Get(Profile* profile,
+                                 ChooserType content_settings_type);
+
+  // Return all the factories related to ChooserContext. These are the factories
+  // used by ::Get() to create a ChooserContextBase. This is meant to be used by
+  // callers of ::Get() that need to depend on these factories.
+  static const std::list<KeyedServiceBaseFactory*>& GetFactories();
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ChooserContext);
+};
+
+#endif  // CHROME_BROWSER_PERMISSIONS_CHOOSER_CONTEXT_H_