Add support for the object-fit CSS property.

Source/core/platform/graphics/LayoutSize.h

Index: Source/core/platform/graphics/LayoutSize.h
diff --git a/Source/core/platform/graphics/LayoutSize.h b/Source/core/platform/graphics/LayoutSize.h
index 3bce732113d63b08f772bc32e6d75e8a8da6a34c..3844e6b66ce78d33618f31c39d1d7a206595db9f 100644
--- a/Source/core/platform/graphics/LayoutSize.h
+++ b/Source/core/platform/graphics/LayoutSize.h
@@ -39,6 +39,11 @@ namespace WebCore {
 
 class LayoutPoint;
 
+enum AspectRatioFit {
+    AspectRatioFitShrink,
+    AspectRatioFitGrow
+};
+
 class LayoutSize {
 public:
     LayoutSize() : m_width(0), m_height(0) { }
@@ -112,6 +117,15 @@ public:
         return LayoutSize(m_height, m_width);
     }
 
+    LayoutSize fitToAspectRatio(const LayoutSize& aspectRatio, AspectRatioFit fit) const
+    {
+        float heightScale = height().toFloat() / aspectRatio.height().toFloat();
+        float widthScale = width().toFloat() / aspectRatio.width().toFloat();
+        if ((widthScale > heightScale) != (fit == AspectRatioFitGrow))
+            return LayoutSize(height() * aspectRatio.width() / aspectRatio.height(), height());
+        return LayoutSize(width(), width() * aspectRatio.height() / aspectRatio.width());
+    }
+
 private:
     LayoutUnit m_width, m_height;
 };