Events ignoring ack disposition receive synthetic acks.

content/browser/renderer_host/input/immediate_input_router.h

 // Copyright 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_IMMEDIATE_INPUT_ROUTER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_IMMEDIATE_INPUT_ROUTER_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
@@ skipping 112 matching lines @@
   void OnMsgMoveCaretAck();
   void OnSelectRangeAck();
   void OnHasTouchEventHandlers(bool has_handlers);
 
   // Indicates the source of an ack provided to |ProcessInputEventAck()|.
   // The source is tracked by |current_ack_source_|, which aids in ack routing.
   enum AckSource {
     RENDERER,
     CLIENT,
     OVERSCROLL_CONTROLLER,
+    IGNORING_DISPOSITION,
     ACK_SOURCE_NONE
   };
   // Note: This function may result in |this| being deleted, and as such
   // should be the last method called in any internal chain of event handling.
   void ProcessInputEventAck(blink::WebInputEvent::Type event_type,
                             InputEventAckState ack_result,
                             const ui::LatencyInfo& latency_info,
                             AckSource ack_source);
 
   // Dispatches the ack'ed event to |ack_handler_|.
@@ skipping 97 matching lines @@
 
   scoped_ptr<TouchEventQueue> touch_event_queue_;
   scoped_ptr<GestureEventFilter> gesture_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ImmediateInputRouter);
 };
 
 }  // namespace content
 
 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_IMMEDIATE_INPUT_ROUTER_H_