Refactor OAuth2TokenService to have profile- and device-based implementations.

chrome/browser/signin/android_profile_oauth2_token_service.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_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_
+#define CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_
+
+#include <string>
+
+#include "chrome/browser/signin/profile_oauth2_token_service.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+class TokenService;
+
+// A specialization of ProfileOAuth2TokenService that will be returned by
+// ProfileOAuth2TokenServiceFactory for OS_ANDROID.  This instance uses
+// native Android features to lookup OAuth2 tokens.
+//
+// See |ProfileOAuth2TokenService| for usage details.
+//
+// Note: requests should be started from the UI thread. To start a
+// request from other thread, please use ProfileOAuth2TokenServiceRequest.
+class AndroidProfileOAuth2TokenService : public ProfileOAuth2TokenService {
+ public:
+  // Start the OAuth2 access token for the given scopes using
+  // ProfileSyncServiceAndroid.
+  virtual scoped_ptr<OAuth2TokenService::Request> StartRequest(
+      const OAuth2TokenService::ScopeSet& scopes,
+      OAuth2TokenService::Consumer* consumer) OVERRIDE;
+
+  virtual void InvalidateToken(const ScopeSet& scopes,
+                               const std::string& invalid_token) OVERRIDE;
+
+ protected:
+  friend class ProfileOAuth2TokenServiceFactory;
+  explicit AndroidProfileOAuth2TokenService(
+      net::URLRequestContextGetter* getter);
+  virtual ~AndroidProfileOAuth2TokenService();
+
+  // Takes injected TokenService for testing.
+  bool ShouldCacheForRefreshToken(TokenService *token_service,
+                                  const std::string& refresh_token);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AndroidProfileOAuth2TokenService);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_