Add support for the object-fit CSS property.

Source/core/rendering/style/RenderStyle.h

Index: Source/core/rendering/style/RenderStyle.h
diff --git a/Source/core/rendering/style/RenderStyle.h b/Source/core/rendering/style/RenderStyle.h
index b4c6a66f91eeb74bd5b39731ceb5d4c8ee0c2ad8..5c3303c1ba34be611d376ad1c8770fbd0b49ee70 100644
--- a/Source/core/rendering/style/RenderStyle.h
+++ b/Source/core/rendering/style/RenderStyle.h
@@ -818,6 +818,8 @@ public:
 
     TextOrientation textOrientation() const { return static_cast<TextOrientation>(rareInheritedData->m_textOrientation); }
 
+    EObjectFit objectFit() const { return static_cast<EObjectFit>(rareNonInheritedData->m_objectFit); }
+
     // Return true if any transform related property (currently transform, transformStyle3D or perspective)
     // indicates that we are transforming
     bool hasTransformRelatedProperty() const { return hasTransform() || preserves3D() || hasPerspective(); }
@@ -1251,6 +1253,8 @@ public:
     void setTextEmphasisPosition(TextEmphasisPosition position) { SET_VAR(rareInheritedData, textEmphasisPosition, position); }
     bool setTextOrientation(TextOrientation);
 
+    void setObjectFit(EObjectFit f) { SET_VAR(rareNonInheritedData, m_objectFit, f); }
+
     void setRubyPosition(RubyPosition position) { SET_VAR(rareInheritedData, m_rubyPosition, position); }
 
     void setFilter(const FilterOperations& ops) { SET_VAR(rareNonInheritedData.access()->m_filter, m_operations, ops); }
@@ -1454,6 +1458,7 @@ public:
     static WritingMode initialWritingMode() { return TopToBottomWritingMode; }
     static TextCombine initialTextCombine() { return TextCombineNone; }
     static TextOrientation initialTextOrientation() { return TextOrientationVerticalRight; }
+    static EObjectFit initialObjectFit() { return ObjectFitFill; }
     static EDisplay initialDisplay() { return INLINE; }
     static EEmptyCell initialEmptyCells() { return SHOW; }
     static EFloat initialFloating() { return NoFloat; }