Log dropped input events

ui/events/ozone/evdev/event_converter_evdev_impl.cc

 // Copyright 2014 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 "ui/events/ozone/evdev/event_converter_evdev_impl.h"
 
 #include <errno.h>
 #include <linux/input.h>
 
 #include "ui/events/event.h"
@@ skipping 78 matching lines @@
   for (int i = 0; i < count; ++i) {
     const input_event& input = inputs[i];
     switch (input.type) {
       case EV_KEY:
         ConvertKeyEvent(input);
         break;
       case EV_REL:
         ConvertMouseMoveEvent(input);
         break;
       case EV_SYN:
+        if (input.code == SYN_DROPPED)
+          LOG(WARNING) << "kernel dropped input events";
         FlushEvents();
         break;
     }
   }
 }
 
 void EventConverterEvdevImpl::ConvertKeyEvent(const input_event& input) {
   // Ignore repeat events.
   if (input.value == kKeyRepeatValue)
     return;
@@ skipping 42 matching lines @@
   cursor_->MoveCursor(gfx::Vector2dF(x_offset_, y_offset_));
 
   dispatcher_->DispatchMouseMoveEvent(
       MouseMoveEventParams(id_, cursor_->GetLocation()));
 
   x_offset_ = 0;
   y_offset_ = 0;
 }
 
 }  // namespace ui