Implement langageSettingsPrivate API.

chrome/browser/extensions/api/language_settings_private/language_settings_private_delegate.h

 // Copyright 2015 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_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_DELEGATE_H_
 
+#include "base/memory/weak_ptr.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "chrome/browser/spellchecker/spellcheck_custom_dictionary.h"
+#include "chrome/browser/spellchecker/spellcheck_hunspell_dictionary.h"
 #include "chrome/common/extensions/api/language_settings_private.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/event_router.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace extensions {
 
 // Observes language settings and routes changes as events to listeners of the
 // languageSettingsPrivate API.
 class LanguageSettingsPrivateDelegate
     : public KeyedService,
-      public EventRouter::Observer {
+      public EventRouter::Observer,
+      public content::NotificationObserver,
+      public SpellcheckHunspellDictionary::Observer,
+      public SpellcheckCustomDictionary::Observer {
  public:
   static LanguageSettingsPrivateDelegate* Create(
       content::BrowserContext* browser_context);
   ~LanguageSettingsPrivateDelegate() override;
 
+  // Returns the languages and statuses of the enabled spellcheck dictionaries.
+  ScopedVector<api::language_settings_private::SpellcheckDictionaryStatus>
+      GetHunspellDictionaryStatuses();
+
  protected:
   explicit LanguageSettingsPrivateDelegate(content::BrowserContext* context);
 
   // KeyedService implementation.
   void Shutdown() override;
 
   // EventRouter::Observer implementation.
   void OnListenerAdded(const EventListenerInfo& details) override;
   void OnListenerRemoved(const EventListenerInfo& details) override;
 
+  // content::NotificationObserver implementation.
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  // SpellcheckHunspellDictionary::Observer implementation.
+  void OnHunspellDictionaryInitialized() override;
+  void OnHunspellDictionaryDownloadBegin() override;
+  void OnHunspellDictionaryDownloadSuccess() override;
+  void OnHunspellDictionaryDownloadFailure() override;
+
+  // SpellcheckCustomDictionary::Observer implementation.
+  void OnCustomDictionaryLoaded() override;
+  void OnCustomDictionaryChanged(
+      const SpellcheckCustomDictionary::Change& dictionary_change) override;
+
  private:
+  typedef std::vector<base::WeakPtr<SpellcheckHunspellDictionary>>
+      WeakDictionaries;
+
+  // Updates the dictionaries that are used for spellchecking.
+  void RefreshDictionaries(bool was_listening, bool should_listen);
+
+  // Returns the hunspell dictionaries that are used for spellchecking.
+  const WeakDictionaries& GetHunspellDictionaries();
+
   // If there are any JavaScript listeners registered for spellcheck events,
   // ensures we are registered for change notifications. Otherwise, unregisters
   // any observers.
   void StartOrStopListeningForSpellcheckChanges();
 
+  // Handles the preference for which languages should be used for spellcheck
+  // by resetting the dictionaries and broadcasting an event.
+  void OnSpellcheckDictionariesChanged();
+
+  // Broadcasts an event with the list of spellcheck dictionary statuses.
+  void BroadcastDictionariesChangedEvent();
+
+  // Removes observers from hunspell_dictionaries_.
+  void RemoveDictionaryObservers();
+
+  // The hunspell dictionaries that are used for spellchecking.
+  WeakDictionaries hunspell_dictionaries_;
+
+  // The custom dictionary that is used for spellchecking.
+  SpellcheckCustomDictionary* custom_dictionary_;
+
   content::BrowserContext* context_;
 
   // True if there are observers listening for spellcheck events.
   bool listening_spellcheck_;
 
+  // True if the profile has finished initializing.
+  bool profile_added_;
+
+  content::NotificationRegistrar notification_registrar_;
+
+  PrefChangeRegistrar pref_change_registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_DELEGATE_H_