Lazy initialization for ExtensionInputMethodEventRouter

chrome/browser/chromeos/extensions/input_method_api.h

 // Copyright (c) 2011 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_EXTENSIONS_INPUT_METHOD_API_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_INPUT_METHOD_API_H_
 
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+
+namespace chromeos {
+class ExtensionInputMethodEventRouter;
+}
 
 namespace extensions {
 
 // Implements the experimental.inputMethod.get method.
 class GetInputMethodFunction : public SyncExtensionFunction {
  public:
   GetInputMethodFunction();
 
  protected:
   virtual ~GetInputMethodFunction();
 
   virtual bool RunImpl() OVERRIDE;
 
  private:
   DECLARE_EXTENSION_FUNCTION_NAME("inputMethodPrivate.get");
 };
 
+class InputMethodAPI : public ProfileKeyedService,
+                       public extensions::EventRouter::Observer {
+ public:
+  explicit InputMethodAPI(Profile* profile);
+  virtual ~InputMethodAPI();
+
+  // Returns input method name for the given XKB (X keyboard extensions in X
+  // Window System) id.
+  static std::string GetInputMethodForXkb(const std::string& xkb_id);
+
+  // ProfileKeyedService implementation.
+  virtual void Shutdown() OVERRIDE;
+
+  // EventRouter::Observer implementation.
+  virtual void OnListenerAdded(const extensions::EventListenerInfo& details)
+      OVERRIDE;
+
+ private:
+  Profile* const profile_;
+
+  // Created lazily upon OnListenerAdded.
+  scoped_ptr<chromeos::ExtensionInputMethodEventRouter>
+      input_method_event_router_;
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_INPUT_METHOD_API_H_