Add an option in language settings for activating the IME menu.

chrome/browser/chromeos/extensions/ime_menu_event_router.cc

+// 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.
+
+#include "chrome/browser/chromeos/extensions/ime_menu_event_router.h"
+
+#include <algorithm>
+
+#include "base/values.h"
+#include "chrome/browser/chromeos/extensions/input_method_api.h"
+#include "content/public/browser/browser_context.h"
+#include "extensions/browser/event_router.h"
+
+namespace chromeos {
+
+ExtensionImeMenuEventRouter::ExtensionImeMenuEventRouter(
+    content::BrowserContext* context)
+    : context_(context) {
+  input_method::InputMethodManager::Get()->AddImeMenuObserver(this);
+}
+
+ExtensionImeMenuEventRouter::~ExtensionImeMenuEventRouter() {
+  input_method::InputMethodManager::Get()->RemoveImeMenuObserver(this);
+}
+
+void ExtensionImeMenuEventRouter::ImeMenuActivated(
+    input_method::InputMethodManager* manager) {

[Shu Chen, 2015/12/28 16:41:46]

Unused |manager| param.

[Azure Wei, 2016/01/04 06:30:38]

This file will be added in another cl.

+  extensions::EventRouter* router = extensions::EventRouter::Get(context_);
+
+  if (!router->HasEventListener(
+          extensions::InputMethodAPI::kOnImeMenuActivated)) {
+    return;
+  }
+
+  scoped_ptr<base::ListValue> args(new base::ListValue());
+
+  // The router will only send the event to extensions that are listening.
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::events::INPUT_METHOD_PRIVATE_ON_IME_MENU_ACTIVATED,
+      extensions::InputMethodAPI::kOnImeMenuActivated, std::move(args)));
+  event->restrict_to_browser_context = context_;
+  router->BroadcastEvent(std::move(event));
+}
+
+void ExtensionImeMenuEventRouter::ImeMenuDeactivated(
+    input_method::InputMethodManager* manager) {

[Shu Chen, 2015/12/28 16:41:47]

ditto.

+  extensions::EventRouter* router = extensions::EventRouter::Get(context_);
+
+  if (!router->HasEventListener(
+          extensions::InputMethodAPI::kOnImeMenuDeactivated)) {
+    return;
+  }
+
+  scoped_ptr<base::ListValue> args(new base::ListValue());
+
+  // The router will only send the event to extensions that are listening.
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::events::INPUT_METHOD_PRIVATE_ON_IME_MENU_DEACTIVATED,
+      extensions::InputMethodAPI::kOnImeMenuDeactivated, std::move(args)));
+  event->restrict_to_browser_context = context_;
+  router->BroadcastEvent(std::move(event));
+}
+
+}  // namespace chromeos