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

ui/aura/window_event_dispatcher.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/aura/window_event_dispatcher.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 53 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowEventDispatcher, public:
 
 WindowEventDispatcher::WindowEventDispatcher(WindowTreeHost* host)
     : host_(host),
       mouse_pressed_handler_(NULL),
       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),
       observer_manager_(this),
       env_controller_(new EnvInputStateController),
       repost_event_factory_(this),
       held_event_factory_(this) {
   ui::GestureRecognizer::Get()->AddGestureEventHelper(this);
   Env::GetInstance()->AddObserver(this);
   if (Env::GetInstance()->mode() == Env::Mode::MUS)
@@ skipping 333 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // WindowEventDispatcher, ui::EventProcessor implementation:
 ui::EventTarget* WindowEventDispatcher::GetRootTarget() {
   return window();
 }
 
 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);
 }
 
 void WindowEventDispatcher::OnEventProcessingFinished(ui::Event* event) {
   if (mus_mouse_location_updater_)
     mus_mouse_location_updater_->OnEventProcessingFinished();
 }
 
@@ skipping 431 matching lines @@
   }
 
   // This flag is set depending on the gestures recognized in the call above,
   // and needs to propagate with the forwarded event.
   event->set_may_cause_scrolling(orig_event.may_cause_scrolling());
 
   return PreDispatchLocatedEvent(target, event);
 }
 
 }  // namespace aura