ui::LocatedEvent location() returns gfx::PointF

ui/views/controls/scrollbar/base_scroll_bar_thumb.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 "ui/views/controls/scrollbar/base_scroll_bar_thumb.h"
 
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/controls/scrollbar/base_scroll_bar.h"
 
@@ skipping 92 matching lines @@
       thumb_x *= -1;
     scroll_bar_->ScrollToThumbPosition(GetPosition() + thumb_x, false);
   } else {
     int thumb_y = event.y() - mouse_offset_;
     scroll_bar_->ScrollToThumbPosition(GetPosition() + thumb_y, false);
   }
   return true;
 }
 
 void BaseScrollBarThumb::OnMouseReleased(const ui::MouseEvent& event) {
-  SetState(HitTestPoint(event.location()) ?
-           CustomButton::STATE_HOVERED : CustomButton::STATE_NORMAL);
+  SetState(HitTestPoint(gfx::ToFlooredPoint(event.location()))
+               ? CustomButton::STATE_HOVERED
+               : CustomButton::STATE_NORMAL);
 }
 
 void BaseScrollBarThumb::OnMouseCaptureLost() {
   SetState(CustomButton::STATE_HOVERED);
 }
 
 CustomButton::ButtonState BaseScrollBarThumb::GetState() const {
   return state_;
 }
 
 void BaseScrollBarThumb::SetState(CustomButton::ButtonState state) {
   if (state_ == state)
     return;
 
   CustomButton::ButtonState old_state = state_;
   state_ = state;
   scroll_bar_->OnThumbStateChanged(old_state, state);
   SchedulePaint();
 }
 
 }  // namespace views