[Android] Add AppMenu touch duration metric.

chrome/browser/android/appmenu/app_menu_drag_helper.h

Index: chrome/browser/android/appmenu/app_menu_drag_helper.h
diff --git a/chrome/browser/android/appmenu/app_menu_drag_helper.h b/chrome/browser/android/appmenu/app_menu_drag_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..5fe466c308e52f95157517fbb4c2a971bb0d14ec
--- /dev/null
+++ b/chrome/browser/android/appmenu/app_menu_drag_helper.h
@@ -0,0 +1,18 @@
+// Copyright 2014 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_ANDROID_APPMENU_APP_MENU_DRAG_HELPER_H_
+#define CHROME_BROWSER_ANDROID_APPMENU_APP_MENU_DRAG_HELPER_H_
+
+#include "base/android/jni_android.h"
+
+namespace appmenu {
+namespace android {
+
+bool RegisterAppMenuDragHelper(JNIEnv* env);
+
+}  // namespace android
+}  // namespace appmenu
+
+#endif  // CHROME_BROWSER_ANDROID_APPMENU_APP_MENU_DRAG_HELPER_H_