Identity API: add multi-account support to token cache and request queues

chrome/browser/extensions/api/identity/extension_token_key.h

+// Copyright 2013 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_EXTENSIONS_API_IDENTITY_EXTENSION_TOKEN_KEY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_IDENTITY_EXTENSION_TOKEN_KEY_H_
+
+#include <set>
+#include <string>
+
+namespace extensions {
+
+struct ExtensionTokenKey {
+  ExtensionTokenKey(const std::string& extension_id,
+                    const std::string& account_id,
+                    const std::set<std::string> scopes);
+  ~ExtensionTokenKey();
+  bool operator<(const ExtensionTokenKey& rhs) const;
+  std::string extension_id;
+  std::string account_id;
+  std::set<std::string> scopes;
+};
+
+}  // namespace extensions
+
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_IDENTITY_EXTENSION_TOKEN_KEY_H_