Fix form validation bubble positioning at hidpi.

content/browser/renderer_host/render_widget_host_view_aura.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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2008 matching lines @@
 bool RenderWidgetHostViewAura::OnShowContextMenu(
     const ContextMenuParams& params) {
 #if defined(OS_WIN)
   event_handler_->SetContextMenuParams(params);
   return params.source_type != ui::MENU_SOURCE_LONG_PRESS;
 #else
   return true;
 #endif  // defined(OS_WIN)
 }
 
+float RenderWidgetHostViewAura::GetDeviceScaleFactor() const {
+  return device_scale_factor_;
+}
+
 void RenderWidgetHostViewAura::SetSelectionControllerClientForTest(
     std::unique_ptr<TouchSelectionControllerClientAura> client) {
   selection_controller_client_.swap(client);
   CreateSelectionController();
 }
 
 void RenderWidgetHostViewAura::InternalSetBounds(const gfx::Rect& rect) {
   SnapToPhysicalPixelBoundary();
   // Don't recursively call SetBounds if this bounds update is the result of
   // a Window::SetBoundsInternal call.
@@ skipping 341 matching lines @@
 
 void RenderWidgetHostViewAura::SetPopupChild(
     RenderWidgetHostViewAura* popup_child_host_view) {
   popup_child_host_view_ = popup_child_host_view;
   event_handler_->SetPopupChild(
       popup_child_host_view,
       popup_child_host_view ? popup_child_host_view->event_handler() : nullptr);
 }
 
 }  // namespace content