Bundle DidOverscrollParams with the InputEventAck

content/renderer/render_widget.cc

 // Copyright (c) 2012 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 "content/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_synthetic_delay.h"
@@ skipping 1036 matching lines @@
       base::TimeTicks end_time = base::TimeTicks::HighResNow();
       total_input_handling_time_this_frame_ += (end_time - start_time);
       rate_limiting_wanted =
           total_input_handling_time_this_frame_.InMicroseconds() >
           kInputHandlingTimeThrottlingThresholdMicroseconds;
   }
 
   TRACE_EVENT_SYNTHETIC_DELAY_END("blink.HandleInputEvent");
 
   if (!WebInputEventTraits::IgnoresAckDisposition(*input_event)) {
+    InputHostMsg_HandleInputEvent_ACK_Params ack;
+    ack.type = input_event->type;
+    ack.state = ack_result;
+    ack.latency = swap_latency_info;
     scoped_ptr<IPC::Message> response(
-        new InputHostMsg_HandleInputEvent_ACK(routing_id_,
-                                              input_event->type,
-                                              ack_result,
-                                              swap_latency_info));
+        new InputHostMsg_HandleInputEvent_ACK(routing_id_, ack));
     if (rate_limiting_wanted && event_type_can_be_rate_limited &&
         frame_pending && !is_hidden_) {
       // We want to rate limit the input events in this case, so we'll wait for
       // painting to finish before ACKing this message.
       TRACE_EVENT_INSTANT0("renderer",
         "RenderWidget::OnHandleInputEvent ack throttled",
         TRACE_EVENT_SCOPE_THREAD);
       if (pending_input_event_ack_) {
         // As two different kinds of events could cause us to postpone an ack
         // we send it now, if we have one pending. The Browser should never
@@ skipping 1001 matching lines @@
 
 void RenderWidget::RegisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.RemoveObserver(frame);
 }
 
 }  // namespace content