Pepper Flash settings integration: add UI for "deauthorize content licenses".

chrome/browser/plugin_status_pref_setter.h

+// Copyright (c) 2012 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_PLUGIN_STATUS_PREF_SETTER_H_
+#define CHROME_BROWSER_PLUGIN_STATUS_PREF_SETTER_H_
+#pragma once
+
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/prefs/pref_member.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class PluginPrefs;
+class PrefService;
+class Profile;
+
+namespace webkit {
+struct WebPluginInfo;
+}
+
+// Helper class modeled after BooleanPrefMember to (asynchronously) update
+// preferences related to plugin enable status.
+// It should only be used from the UI thread. The user has to make sure that
+// the passed PluginStatusPrefSetter::Client objects and profile outlive this
+// object.
+class PluginStatusPrefSetter : public content::NotificationObserver {
+ public:
+  PluginStatusPrefSetter();
+  virtual ~PluginStatusPrefSetter();
+
+  class Client {
+   public:
+    Client();
+    virtual ~Client();
+
+    virtual const char* GetPrefName() const = 0;
+    virtual bool CalculatePrefValue(PluginPrefs* plugin_prefs) = 0;
+
+    // Called by PluginStatusPrefSetter.
+    void Init(PrefService* prefs, content::NotificationObserver* observer);
+
+    bool GetValue() const { return pref_.GetValue(); }
+
+   protected:
+    BooleanPrefMember pref_;
+  };
+
+  // Binds |clients| to the preferences in the profile's PrefService, notifying
+  // |observer| if any value changes.
+  // This asynchronously calls the PluginService to get the list of installed
+  // plug-ins.
+  void Init(const std::vector<Client*>& clients,
+            Profile* profile,
+            content::NotificationObserver* observer);
+
+  // content::NotificationObserver methods:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  void StartUpdate();
+  void GotPlugins(scoped_refptr<PluginPrefs> plugin_prefs,
+                  const std::vector<webkit::WebPluginInfo>& plugins);
+
+  // Not owned by this object.
+  std::vector<Client*> clients_;
+  content::NotificationRegistrar registrar_;
+  // Weak pointer.
+  Profile* profile_;
+  base::WeakPtrFactory<PluginStatusPrefSetter> factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PluginStatusPrefSetter);
+};
+
+#endif  // CHROME_BROWSER_PLUGIN_STATUS_PREF_SETTER_H_