blimp: Add settings to allow the client to download the whole page.

blimp/engine/app/settings_manager.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 BLIMP_ENGINE_APP_SETTINGS_MANAGER_H_
+#define BLIMP_ENGINE_APP_SETTINGS_MANAGER_H_
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "blimp/engine/app/engine_settings.h"
+#include "blimp/net/blimp_message_processor.h"
+#include "content/public/browser/render_view_host.h"
+
+namespace blimp {
+namespace engine {
+
+// This class is owned by the BlimpBrowserMainParts and manages the
+// |EngineSettings| that can be set on the engine.
+class SettingsManager {
+ public:
+  // An observer interested in knowing when the engine settings have changed.
+  class Observer {
+   public:
+    // Called when the WebPreferences have changed. See content::WebPreferences.
+    virtual void OnWebPreferencesChanged() {}
+  };
+
+  SettingsManager();
+  ~SettingsManager();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Called to update the WebPreferences.
+  void UpdateWebkitPreferences(content::WebPreferences* prefs);
+
+  const EngineSettings& GetEngineSettings() const;
+  void UpdateEngineSettings(const EngineSettings& settings);
+
+ private:
+  EngineSettings settings_;
+
+  base::ObserverList<Observer> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsManager);
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_APP_SETTINGS_MANAGER_H_