Rect - Change to use Math.Ceiling as that appears to match what CEF uses

cefclient uses Math.Floor though when I examine the values returned they're always one less
use use Math.Ceiling appears to match

Author: amaitland

CefSharp.Wpf/ChromiumWebBrowser.cs

@@ -459,7 +459,7 @@ public IRequestContext RequestContext
         /// you must manually call IBrowserHost.NotifyScreenInfoChanged for the
         /// browser to be notified of the change.
         /// </summary>
-        public double DpiScaleFactor { get; set; }
+        public float DpiScaleFactor { get; set; }
 
         /// <summary>
         /// Initializes static members of the <see cref="ChromiumWebBrowser"/> class.
@@ -1672,7 +1672,7 @@ private void PresentationSourceChangedHandler(object sender, SourceChangedEventA
                 var matrix = source.CompositionTarget.TransformToDevice;
                 var notifyDpiChanged = DpiScaleFactor > 0 && !DpiScaleFactor.Equals(matrix.M11);
 
-                DpiScaleFactor = source.CompositionTarget.TransformToDevice.M11;
+                DpiScaleFactor = (float)source.CompositionTarget.TransformToDevice.M11;
 
                 WpfKeyboardHandler.Setup(source);
 

CefSharp/Structs/Rect.cs

@@ -54,12 +54,12 @@ public Rect(int x, int y, int width, int height)
         /// </summary>
         /// <param name="dpi">Dpi to scale by</param>
         /// <returns>New rect with scaled values</returns>
-        public Rect ScaleByDpi(double dpi)
+        public Rect ScaleByDpi(float dpi)
         {
-            var x = (int)Math.Floor(X / dpi);
-            var y = (int)Math.Floor(Y / dpi);
-            var width = (int)Math.Floor(Width / dpi);
-            var height = (int)Math.Floor(Height / dpi);
+            var x = (int)Math.Ceiling(X / dpi);
+            var y = (int)Math.Ceiling(Y / dpi);
+            var width = (int)Math.Ceiling(Width / dpi);
+            var height = (int)Math.Ceiling(Height / dpi);
 
             return new Rect(x, y, width, height);
         }