[Android] Trigger native event batching through Feature API

content/browser/android/content_feature_list.h

+// Copyright 2017 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 CONTENT_BROWSER_ANDROID_CONTENT_FEATURE_LIST_H_
+#define CONTENT_BROWSER_ANDROID_CONTENT_FEATURE_LIST_H_
+
+#include <jni.h>
+
+#include "base/feature_list.h"
+
+namespace content {
+namespace android {
+
+// Alphabetical:
+extern const base::Feature kRequestUnbufferedDispatch;
+
+bool RegisterContentFeatureListJni(JNIEnv* env);
+
+}  // namespace android
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_ANDROID_CONTENT_FEATURE_LIST_H_