Modify languageSettingsPrivate IDL and flesh out stub implementation

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

Index: chrome/browser/extensions/api/language_settings_private/language_settings_private_delegate_factory.h
diff --git a/chrome/browser/extensions/api/language_settings_private/language_settings_private_delegate_factory.h b/chrome/browser/extensions/api/language_settings_private/language_settings_private_delegate_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7b1cded5460bcf54eb31c48e07c955824c8b509
--- /dev/null
+++ b/chrome/browser/extensions/api/language_settings_private/language_settings_private_delegate_factory.h
@@ -0,0 +1,53 @@
+// 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_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_DELEGATE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+
+class LanguageSettingsPrivateDelegate;
+
+// This is a factory class used by the BrowserContextDependencyManager
+// to instantiate the languageSettingsPrivate delegate per browsing context
+// (since the extension event router and language preferences are per browsing
+// context).
+class LanguageSettingsPrivateDelegateFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the LanguageSettingsPrivateDelegate for |context|, creating it
+  // if it is not yet created.
+  static LanguageSettingsPrivateDelegate* GetForBrowserContext(
+      content::BrowserContext* context);
+
+  // Returns the LanguageSettingsPrivateDelegateFactory instance.
+  static LanguageSettingsPrivateDelegateFactory* GetInstance();
+
+ protected:
+  // BrowserContextKeyedBaseFactory overrides:
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+  bool ServiceIsCreatedWithBrowserContext() const override;
+  bool ServiceIsNULLWhileTesting() const override;
+
+ private:
+  friend struct DefaultSingletonTraits<
+      LanguageSettingsPrivateDelegateFactory>;
+
+  LanguageSettingsPrivateDelegateFactory();
+  ~LanguageSettingsPrivateDelegateFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(LanguageSettingsPrivateDelegateFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_LANGUAGE_SETTINGS_PRIVATE_LANGUAGE_SETTINGS_PRIVATE_DELEGATE_FACTORY_H_