Add chrome.inputMethodPrivate.onImeMenuActivationChanged API.

chrome/browser/chromeos/extensions/ime_menu_event_router.cc

+// Copyright 2016 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 "base/values.h"
+#include "chrome/browser/chromeos/extensions/input_method_api.h"
+#include "chrome/common/extensions/api/input_method_private.h"
+#include "content/public/browser/browser_context.h"
+#include "extensions/browser/event_router.h"
+
+namespace OnImeMenuActivationChanged =
+    extensions::api::input_method_private::OnImeMenuActivationChanged;
+
+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::ImeMenuActivationChanged(bool activation) {
+  extensions::EventRouter* router = extensions::EventRouter::Get(context_);
+
+  if (!router->HasEventListener(OnImeMenuActivationChanged::kEventName))
+    return;
+
+  scoped_ptr<base::ListValue> args(new base::ListValue());
+  args->AppendBoolean(activation);
+
+  // 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_ACTIVATION_CHANGED,
+      OnImeMenuActivationChanged::kEventName, std::move(args)));
+  event->restrict_to_browser_context = context_;
+  router->BroadcastEvent(std::move(event));
+}
+
+}  // namespace chromeos