arc: Enable silent PlayStore Sign-In.

chrome/browser/chromeos/arc/arc_auth_code_fetcher.h

Index: chrome/browser/chromeos/arc/arc_auth_code_fetcher.h
diff --git a/chrome/browser/chromeos/arc/arc_auth_code_fetcher.h b/chrome/browser/chromeos/arc/arc_auth_code_fetcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..6912012d6ba1a4710d6388a3c8f95a9df6d5765a
--- /dev/null
+++ b/chrome/browser/chromeos/arc/arc_auth_code_fetcher.h
@@ -0,0 +1,64 @@
+// 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_CODE_FETCHER_H_
+#define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CODE_FETCHER_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "google_apis/gaia/oauth2_token_service.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+class Profile;
+
+namespace net {
+class URLFetcherDelegate;

[xiyuan, 2016/09/07 23:20:09]

nit: not needed since we need to include the header.

[khmel, 2016/09/07 23:30:12]

Good catch, I meant URLFetcher actually.

+class URLRequestContextGetter;
+}
+
+namespace arc {
+
+class ArcAuthCodeFetcherDelegate;
+
+class ArcAuthCodeFetcher : public OAuth2TokenService::Consumer,
+                           public net::URLFetcherDelegate {
+ public:
+  ArcAuthCodeFetcher(ArcAuthCodeFetcherDelegate* delegate,
+                     net::URLRequestContextGetter* request_context_getter,
+                     Profile* profile,
+                     const std::string& auth_endpoint);
+  ~ArcAuthCodeFetcher() 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;
+
+ private:
+  void ResetFetchers();
+
+  // Unowned pointers.
+  ArcAuthCodeFetcherDelegate* const delegate_;
+  net::URLRequestContextGetter* const request_context_getter_;
+  Profile* const profile_;
+
+  // URL to request auth code.
+  std::string auth_endpoint_;

[xiyuan, 2016/09/07 23:20:09]

nit: const since it should not change.

[khmel, 2016/09/07 23:30:12]

Done.

+
+  std::unique_ptr<OAuth2TokenService::Request> login_token_request_;
+  std::unique_ptr<net::URLFetcher> auth_code_fetcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcAuthCodeFetcher);
+};
+
+}  // namespace arc
+
+#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_CODE_FETCHER_H_