Fix event dispatching offset problem in the client-lib in high-dpi mode. (conversion)

ui/aura/window_event_dispatcher.cc

Index: ui/aura/window_event_dispatcher.cc
diff --git a/ui/aura/window_event_dispatcher.cc b/ui/aura/window_event_dispatcher.cc
index 6cd3c43e2dad9addd866098702afd9b64af79343..9cff46bba2f152c36139b4bdbe77074e5ebf07ed 100644
--- a/ui/aura/window_event_dispatcher.cc
+++ b/ui/aura/window_event_dispatcher.cc
@@ -71,6 +71,7 @@ WindowEventDispatcher::WindowEventDispatcher(WindowTreeHost* host)
       mouse_moved_handler_(NULL),
       event_dispatch_target_(NULL),
       old_dispatch_target_(NULL),
+      transform_events_(true),
       synthesize_mouse_move_(false),
       move_hold_count_(0),
       dispatching_held_event_(nullptr),
@@ -424,8 +425,10 @@ void WindowEventDispatcher::OnEventProcessingStarted(ui::Event* event) {
   // The held events are already in |window()|'s coordinate system. So it is
   // not necessary to apply the transform to convert from the host's
   // coordinate system to |window()|'s coordinate system.
-  if (event->IsLocatedEvent() && !is_dispatched_held_event(*event))
+  if (event->IsLocatedEvent() && !is_dispatched_held_event(*event) &&
+      transform_events_) {
     TransformEventForDeviceScaleFactor(static_cast<ui::LocatedEvent*>(event));
+  }
 
   if (mus_mouse_location_updater_)
     mus_mouse_location_updater_->OnEventProcessingStarted(*event);