Accessible bounds should include device scale factor on Windows.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 185 matching lines @@
   void OnAssociatedInterfaceRequest(
       const std::string& interface_name,
       mojo::ScopedInterfaceEndpointHandle handle) override;
 
   // BrowserAccessibilityDelegate
   void AccessibilityPerformAction(const ui::AXActionData& data) override;
   bool AccessibilityViewHasFocus() const override;
   gfx::Rect AccessibilityGetViewBounds() const override;
   gfx::Point AccessibilityOriginInScreen(
       const gfx::Rect& bounds) const override;
+  float AccessibilityGetDeviceScaleFactor() const override;
   void AccessibilityFatalError() override;
   gfx::AcceleratedWidget AccessibilityGetAcceleratedWidget() override;
   gfx::NativeViewAccessible AccessibilityGetNativeViewAccessible() override;
 
   // SiteInstanceImpl::Observer
   void RenderProcessGone(SiteInstanceImpl* site_instance) override;
 
   // Creates a RenderFrame in the renderer process.
   bool CreateRenderFrame(int proxy_routing_id,
                          int opener_routing_id,
@@ skipping 922 matching lines @@
 
   // NOTE: This must be the last member.
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_