[DevTools] Handle emulated device scale factor and original device scale factor properly.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index 6b17ad1c2f770efef21a4ab67ca241208ad02c0f..c627c1ae64dfdd6d2e759291818a104212f654e2 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -766,6 +766,10 @@ class CONTENT_EXPORT RenderWidget
   scoped_ptr<scheduler::RenderWidgetSchedulingState>
       render_widget_scheduling_state_;
 
+ private:
+  // When emulated, this returns original device scale factor.
+  float GetOriginalDeviceScaleFactor() const;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };