mus: Fix event transformation in client code.

ui/events/event.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 "ui/events/event.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 
@@ skipping 426 matching lines @@
                            base::TimeDelta time_stamp,
                            int flags)
     : Event(type, time_stamp, flags),
       location_(location),
       root_location_(root_location) {
 }
 
 void LocatedEvent::UpdateForRootTransform(
     const gfx::Transform& reversed_root_transform) {
   // Transform has to be done at root level.
+  bool locations_equal = location_ == root_location_;
   gfx::Point3F p(location_);
   reversed_root_transform.TransformPoint(&p);
   location_ = p.AsPointF();
-  root_location_ = location_;
+  if (locations_equal) {
+    root_location_ = location_;
+    LOG(ERROR) << name() << " Set to " << root_location_.ToString();
+  } else {
+    p = gfx::Point3F(root_location_);
+    reversed_root_transform.TransformPoint(&p);
+    root_location_ = p.AsPointF();
+    LOG(ERROR) << name() << " Set to " << root_location_.ToString()
+               << " instead of " << location_.ToString();
+  }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // MouseEvent
 
 MouseEvent::MouseEvent(const base::NativeEvent& native_event)
     : LocatedEvent(native_event),
       changed_button_flags_(GetChangedMouseButtonFlagsFromNative(native_event)),
       pointer_details_(GetMousePointerDetailsFromNative(native_event)) {
   if (type() == ET_MOUSE_PRESSED || type() == ET_MOUSE_RELEASED)
@@ skipping 753 matching lines @@
                    gfx::PointF(x, y),
                    time_stamp,
                    flags | EF_FROM_TOUCH),
       details_(details) {
 }
 
 GestureEvent::~GestureEvent() {
 }
 
 }  // namespace ui