Local NTP: Introduce OneGoogleBarFetcher

chrome/browser/search/one_google_bar/one_google_bar_fetcher_impl.h

+// Copyright 2017 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_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_FETCHER_IMPL_H_
+#define CHROME_BROWSER_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_FETCHER_IMPL_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/optional.h"
+#include "chrome/browser/search/one_google_bar/one_google_bar_fetcher.h"
+
+class GoogleURLTracker;
+class OAuth2TokenService;
+class SigninManagerBase;
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}  // namespace net
+
+struct OneGoogleBarData;
+
+class OneGoogleBarFetcherImpl : public OneGoogleBarFetcher {
+ public:
+  OneGoogleBarFetcherImpl(SigninManagerBase* signin_manager,
+                          OAuth2TokenService* token_service,
+                          net::URLRequestContextGetter* request_context,
+                          GoogleURLTracker* google_url_tracker);
+  ~OneGoogleBarFetcherImpl();
+
+  void Fetch(OneGoogleCallback callback) override;
+
+ private:
+  class AuthenticatedURLFetcher;
+
+  void IssueRequestIfNoneOngoing();
+
+  void FetchDone(const net::URLFetcher* source);
+
+  void Respond(const base::Optional<OneGoogleBarData>& data);
+
+  SigninManagerBase* signin_manager_;
+  OAuth2TokenService* token_service_;
+  net::URLRequestContextGetter* request_context_;
+  GoogleURLTracker* google_url_tracker_;
+
+  std::vector<OneGoogleCallback> callbacks_;
+  std::unique_ptr<AuthenticatedURLFetcher> pending_request_;
+
+  DISALLOW_COPY_AND_ASSIGN(OneGoogleBarFetcherImpl);
+};
+
+#endif  // CHROME_BROWSER_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_FETCHER_IMPL_H_