Add support for the object-position CSS property.

Source/core/rendering/RenderImage.cpp

Index: Source/core/rendering/RenderImage.cpp
diff --git a/Source/core/rendering/RenderImage.cpp b/Source/core/rendering/RenderImage.cpp
index 4c66e75d2e9fbce37d4bd18ba48fc19d3b4893fe..5284de460a493b72b5c47c5398b3b15fa6fa742e 100644
--- a/Source/core/rendering/RenderImage.cpp
+++ b/Source/core/rendering/RenderImage.cpp
@@ -516,6 +516,9 @@ bool RenderImage::foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect,
     // Background shows in padding area.
     if ((backgroundClip == BorderFillBox || backgroundClip == PaddingFillBox) && style()->hasPadding())
         return false;
+    // Object-position may leave parts of the content box empty, regardless of the value of object-fit.
+    if (style()->objectPosition() != RenderStyle::initialObjectPosition())
+        return false;
     // Object-fit may leave parts of the content box empty.
     ObjectFit objectFit = style()->objectFit();
     if (objectFit != ObjectFitFill && objectFit != ObjectFitCover)