Add support for the object-fit CSS property.

Source/core/rendering/style/StyleRareNonInheritedData.cpp

Index: Source/core/rendering/style/StyleRareNonInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareNonInheritedData.cpp b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
index c93cdd4bfcc245aed82359d5fd7e94d3d383e5eb..3539ba1477a46011b23a4e98d89277adc40412d5 100644
--- a/Source/core/rendering/style/StyleRareNonInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
@@ -75,6 +75,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
     , m_hasAspectRatio(false)
     , m_effectiveBlendMode(RenderStyle::initialBlendMode())
     , m_touchAction(RenderStyle::initialTouchAction())
+    , m_objectFit(RenderStyle::initialObjectFit())
 {
     m_maskBoxImage.setMaskDefaults();
 }
@@ -147,6 +148,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonInherited
     , m_hasAspectRatio(o.m_hasAspectRatio)
     , m_effectiveBlendMode(o.m_effectiveBlendMode)
     , m_touchAction(o.m_touchAction)
+    , m_objectFit(o.m_objectFit)
 {
 }
 
@@ -221,7 +223,8 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
         && !m_runningAcceleratedAnimation && !o.m_runningAcceleratedAnimation
         && m_effectiveBlendMode == o.m_effectiveBlendMode
         && m_hasAspectRatio == o.m_hasAspectRatio
-        && m_touchAction == o.m_touchAction;
+        && m_touchAction == o.m_touchAction
+        && m_objectFit == o.m_objectFit;
 }
 
 bool StyleRareNonInheritedData::contentDataEquivalent(const StyleRareNonInheritedData& o) const