Send the pending input event ack before the UpdateRect message

content/browser/renderer_host/render_widget_host.cc

 // Copyright (c) 2011 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/browser/renderer_host/render_widget_host.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 536 matching lines @@
 
 void RenderWidgetHost::StopHangMonitorTimeout() {
   time_when_considered_hung_ = Time();
   RendererIsResponsive();
 
   // We do not bother to stop the hung_renderer_timer_ here in case it will be
   // started again shortly, which happens to be the common use case.
 }
 
 void RenderWidgetHost::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
-  TRACE_EVENT0("renderer_host", "RenderWidgetHost::ForwardMouseEvent");
+  TRACE_EVENT2("renderer_host", "RenderWidgetHost::ForwardMouseEvent",
+               "x", mouse_event.x, "y", mouse_event.y);
   if (ignore_input_events_ || process_->IgnoreInputEvents())
     return;
 
   // Avoid spamming the renderer with mouse move events.  It is important
   // to note that WM_MOUSEMOVE events are anyways synthetic, but since our
   // thread is able to rapidly consume WM_MOUSEMOVE events, we may get way
   // more WM_MOUSEMOVE events than we wish to send to the renderer.
   if (mouse_event.type == WebInputEvent::MouseMove) {
     if (mouse_move_pending_) {
       if (!next_mouse_move_.get()) {
@@ skipping 962 matching lines @@
     ui_shim->Send(new AcceleratedSurfaceMsg_BuffersSwappedACK(route_id));
 }
 
 // static
 void RenderWidgetHost::AcknowledgePostSubBuffer(int32 route_id,
                                                 int gpu_host_id) {
   GpuProcessHostUIShim* ui_shim = GpuProcessHostUIShim::FromID(gpu_host_id);
   if (ui_shim)
     ui_shim->Send(new AcceleratedSurfaceMsg_PostSubBufferACK(route_id));
 }