arc: Enable silent PlayStore Sign-In.

chrome/browser/chromeos/arc/arc_auth_context.h

 // Copyright 2016 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_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/timer/timer.h"
+#include "google_apis/gaia/oauth2_token_service.h"
 #include "google_apis/gaia/ubertoken_fetcher.h"
+#include "net/url_request/url_fetcher.h"
 
 class Profile;
 class ProfileOAuth2TokenService;
 
 namespace content {
 class StoragePartition;
 }
 
 namespace arc {
 
 class ArcAuthContextDelegate;
 
 class ArcAuthContext : public UbertokenConsumer,
                        public GaiaAuthConsumer,
-                       public OAuth2TokenService::Observer {
+                       public OAuth2TokenService::Observer,
+                       public OAuth2TokenService::Consumer,
+                       public net::URLFetcherDelegate {

[xiyuan, 2016/09/07 21:07:55]

Can we create a separate class and make it a member of ArcAuthContext instead of
using inheritance? That way, it would be easier to read the code and move it
around (e.g. moving into /google_apis in the future).

[khmel, 2016/09/07 23:08:53]

+1 

  public:
   ArcAuthContext(ArcAuthContextDelegate* delegate, Profile* profile);
   ~ArcAuthContext() override;
 
   void PrepareContext();
+  void FetchAuthCode(const std::string& auth_endpoint);
 
   // OAuth2TokenService::Observer:
   void OnRefreshTokenAvailable(const std::string& account_id) override;
   void OnRefreshTokensLoaded() override;
 
   // UbertokenConsumer:
   void OnUbertokenSuccess(const std::string& token) override;
   void OnUbertokenFailure(const GoogleServiceAuthError& error) override;
 
   // GaiaAuthConsumer:
   void OnMergeSessionSuccess(const std::string& data) override;
   void OnMergeSessionFailure(const GoogleServiceAuthError& error) override;
 
+  // OAuth2TokenService::Consumer:
+  void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
+                         const std::string& access_token,
+                         const base::Time& expiration_time) override;
+  void OnGetTokenFailure(const OAuth2TokenService::Request* request,
+                         const GoogleServiceAuthError& error) override;
+
+  // net::URLFetcherDelegate:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
   const std::string& account_id() const { return account_id_; }
 
   ProfileOAuth2TokenService* token_service() { return token_service_; }
 
  private:
   void StartFetchers();
+  void ResetFetchers();
   void OnRefreshTokenTimeout();
 
   // Unowned pointers.
   ArcAuthContextDelegate* const delegate_;
+  Profile* const profile_;
   ProfileOAuth2TokenService* token_service_;
+  // URL to request auth code.
+  std::string auth_endpoint_;
 
   bool context_prepared_ = false;
 
   // Owned by content::BrowserContent. Used to isolate cookies for auth server
   // communication and shared with Arc OptIn UI platform app.
   content::StoragePartition* storage_partition_ = nullptr;
 
   std::string account_id_;
   std::unique_ptr<GaiaAuthFetcher> merger_fetcher_;
   std::unique_ptr<UbertokenFetcher> ubertoken_fetcher_;
+  std::unique_ptr<OAuth2TokenService::Request> login_token_request_;
+  std::unique_ptr<net::URLFetcher> auth_code_fetcher_;
   base::OneShotTimer refresh_token_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAuthContext);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CONTEXT_H_