Turn ArcSupportHost from Observer model to Delegate

chrome/browser/chromeos/arc/extensions/fake_arc_support.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_EXTENSIONS_FAKE_ARC_SUPPORT_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_EXTENSIONS_FAKE_ARC_SUPPORT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 10 matching lines @@
   explicit FakeArcSupport(ArcSupportHost* support_host);
   ~FakeArcSupport() override;
 
   // Emulates to open ARC support Chrome app, and connect message host to
   // ARC support host.
   void Open(Profile* profile);
 
   // Emulates clicking Close button.
   void Close();
 
+  // Authentication page emulation.
+  void EmulateAuthCodeResponse(const std::string& auth_code);
+  void EmulateAuthFailure();
+
   // Terms of service page emulation.
   // Emulates clicking Agree button.
   void ClickAgreeButton();
 
   bool metrics_mode() const { return metrics_mode_; }
   bool backup_and_restore_mode() const { return backup_and_restore_mode_; }
   bool location_service_mode() const { return location_service_mode_; }
 
   // Emulates checking preference box.
   void set_metrics_mode(bool mode) { metrics_mode_ = mode; }
   void set_backup_and_restore_mode(bool mode) {
     backup_and_restore_mode_ = mode;
   }
   void set_location_service_mode(bool mode) { location_service_mode_ = mode; }
 
   // Error page emulation.
   void ClickRetryButton();
+  void ClickSendFeedbackButton();
 
   // Returns the current page.
   ArcSupportHost::UIPage ui_page() const { return ui_page_; }
 
  private:
+  void UnsetMessageHost();
+
   // extensions::NativeMessageHost::Client:
   void PostMessageFromNativeHost(const std::string& message) override;
   void CloseChannel(const std::string& error_message) override;
+  void OnMessage(const base::DictionaryValue& message);
 
   ArcSupportHost* const support_host_;
 
   std::unique_ptr<extensions::NativeMessageHost> native_message_host_;
   ArcSupportHost::UIPage ui_page_ = ArcSupportHost::UIPage::NO_PAGE;
   bool metrics_mode_ = false;
   bool backup_and_restore_mode_ = false;
   bool location_service_mode_ = false;
 
   base::WeakPtrFactory<FakeArcSupport> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeArcSupport);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_EXTENSIONS_FAKE_ARC_SUPPORT_H_