Support 'extend-to-zoom' viewport descriptor value

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 30e8eb901e26a172d38dff8df9eab70e52d0d328..8f0b817cb10c6c78888c2250885fb464bb9f4906 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -2744,7 +2744,7 @@ LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(Length logicalWidth) cons
             return adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, 0, view()));
         case FitContent:
         case FillAvailable:
-        case Percent: 
+        case Percent:
         case Calculated: {
             // FIXME: containingBlockLogicalWidthForContent() is wrong if the replaced element's block-flow is perpendicular to the
             // containing block's block-flow.
@@ -2763,6 +2763,7 @@ LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(Length logicalWidth) cons
         case MinIntrinsic:
         case Auto:
         case Relative:
+        case ExtendToZoom:
         case Undefined:
             return intrinsicLogicalWidth();
     }