Provided batched input delivery with a BufferedInputRouter

content/browser/renderer_host/input/input_ack_handler.h

Index: content/browser/renderer_host/input/input_ack_handler.h
diff --git a/content/browser/renderer_host/input/input_ack_handler.h b/content/browser/renderer_host/input/input_ack_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..266bceb0c07ca4ddf917f6764e276c713dd4553b
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+++ b/content/browser/renderer_host/input/input_ack_handler.h
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+// Copyright (c) 2013 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_RENDERER_HOST_INPUT_INPUT_ACK_HANDLER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ACK_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "content/port/browser/event_with_latency_info.h"
+#include "content/port/common/input_event_ack_state.h"
+#include "content/public/browser/native_web_keyboard_event.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+
+namespace content {
+
+// Provided customized ack response for input events.
+class InputAckHandler {
+ public:
+  virtual ~InputAckHandler() { }
+
+  // Called upon event ack receipt from the renderer.
+  // TODO(jdduke): These should return a vector of follow-up events.
+  virtual void OnKeyboardEventAck(const NativeWebKeyboardEvent& event,
+                                  InputEventAckState ack_result) = 0;
+  virtual void OnWheelEventAck(const WebKit::WebMouseWheelEvent& event,
+                               InputEventAckState ack_result) = 0;
+  virtual void OnTouchEventAck(const TouchEventWithLatencyInfo& event,
+                               InputEventAckState ack_result) = 0;
+  virtual void OnGestureEventAck(const WebKit::WebGestureEvent& event,
+                                 InputEventAckState ack_result) = 0;
+  virtual void OnUnexpectedEventAck(bool bad_message) = 0;
+};
+
+} // namespace content
+
+#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ACK_HANDLER_H_