Fix form validation bubble positioning at hidpi.

content/public/browser/render_widget_host_view.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_
 
 #include <memory>
 
 #include "base/strings/string16.h"
@@ skipping 154 matching lines @@
   // The |editable| parameter indicates if the node is editable, for e.g.
   // an input field, etc.
   virtual void FocusedNodeTouched(const gfx::Point& location_dips_screen,
                                   bool editable) = 0;
 
   // Informs the view that its associated render widget has frames to draw and
   // wants to have BeginFrame messages sent to it.  This should only be called
   // when the value has changed.  Views must initially default to false.
   virtual void SetNeedsBeginFrames(bool needs_begin_frames) = 0;
 
+  virtual float GetDeviceScaleFactor() const = 0;
+
 #if defined(OS_MACOSX)
   // Return the accelerated widget which hosts the CALayers that draw the
   // content of the view in GetNativeView. This may be null.
   virtual ui::AcceleratedWidgetMac* GetAcceleratedWidgetMac() const = 0;
 
   // Set the view's active state (i.e., tint state of controls).
   virtual void SetActive(bool active) = 0;
 
   // Brings up the dictionary showing a definition for the selected text.
   virtual void ShowDefinitionForSelection() = 0;
 
   // Returns |true| if Mac OS X text to speech is supported.
   virtual bool SupportsSpeech() const = 0;
   // Tells the view to speak the currently selected text.
   virtual void SpeakSelection() = 0;
   // Returns |true| if text is currently being spoken by Mac OS X.
   virtual bool IsSpeaking() const = 0;
   // Stops speaking, if it is currently in progress.
   virtual void StopSpeaking() = 0;
 #endif  // defined(OS_MACOSX)
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_WIDGET_HOST_VIEW_H_