Add SyncAuthProvider interface and implementation

chrome/browser/sync/profile_sync_auth_provider.h

Index: chrome/browser/sync/profile_sync_auth_provider.h
diff --git a/chrome/browser/sync/profile_sync_auth_provider.h b/chrome/browser/sync/profile_sync_auth_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..5ffbc9c094cbd8054a903969a0b426c664265396
--- /dev/null
+++ b/chrome/browser/sync/profile_sync_auth_provider.h
@@ -0,0 +1,69 @@
+// Copyright 2014 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_SYNC_PROFILE_SYNC_AUTH_PROVIDER_H_
+#define CHROME_BROWSER_SYNC_PROFILE_SYNC_AUTH_PROVIDER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "google_apis/gaia/oauth2_token_service.h"
+#include "sync/internal_api/public/sync_auth_provider.h"
+
+class ProfileOAuth2TokenService;
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+// ProfileSyncAuthProvider implements function for SyncAuthProvider. It doesn't
+// inherit from SyncAuthProvider because it lives on UI thread while requests
+// originate from sync thread. SyncThreadProxy implements SyncAuthProvider and
+// forwards all requests.
+class ProfileSyncAuthProvider : public OAuth2TokenService::Consumer,
+                                public base::NonThreadSafe {
+ public:
+  ProfileSyncAuthProvider(ProfileOAuth2TokenService* token_service,
+                          const std::string& account_id,
+                          const std::string& scope);
+  virtual ~ProfileSyncAuthProvider();
+
+  // OAuth2TokenService::Consumer implementation.
+  virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
+                                 const std::string& access_token,
+                                 const base::Time& expiration_time) OVERRIDE;
+  virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
+                                 const GoogleServiceAuthError& error) OVERRIDE;
+
+  // Request access token from OAuth2TokenService. Once access token is received
+  // result should be posted to callback on task_runner thread.
+  void RequestAccessToken(
+      const syncer::SyncAuthProvider::RequestTokenCallback& callback,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+
+  void InvalidateAccessToken(const std::string& token);
+
+  scoped_ptr<syncer::SyncAuthProvider> CreateProviderForSyncThread();
+
+ private:
+  class SyncThreadProxy;
+
+  void RespondToTokenRequest(const GoogleServiceAuthError& error,
+                             const std::string& token);
+
+  ProfileOAuth2TokenService* token_service_;
+  std::string account_id_;
+  OAuth2TokenService::ScopeSet oauth2_scope_;
+
+  // Only one outstanding request is allowed. Previous request is reported
+  // cancelled if new one arrives.
+  scoped_ptr<OAuth2TokenService::Request> access_token_request_;
+  syncer::SyncAuthProvider::RequestTokenCallback request_token_callback_;
+  scoped_refptr<base::SingleThreadTaskRunner> callback_task_runner_;
+
+  base::WeakPtrFactory<ProfileSyncAuthProvider> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProfileSyncAuthProvider);
+};
+
+#endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_AUTH_PROVIDER_H_