Add Length::isPercent and use it in tables.

third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp

Index: third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
diff --git a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
index 2dbc197fab637af8805eb632f6852f038be19c9b..033c781a6abea914097771e609d1b98d14ec9bec 100644
--- a/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
+++ b/third_party/WebKit/Source/core/paint/BackgroundImageGeometry.cpp
@@ -63,12 +63,12 @@ LayoutSize calculateFillTileSize(const LayoutBoxModelObject& obj, const FillLaye
 
         if (layerWidth.isFixed())
             tileSize.setWidth(LayoutUnit(layerWidth.value()));
-        else if (layerWidth.hasPercent())
+        else if (layerWidth.isPercentOrCalc())
             tileSize.setWidth(valueForLength(layerWidth, positioningAreaSize.width()));
 
         if (layerHeight.isFixed())
             tileSize.setHeight(LayoutUnit(layerHeight.value()));
-        else if (layerHeight.hasPercent())
+        else if (layerHeight.isPercentOrCalc())
             tileSize.setHeight(valueForLength(layerHeight, positioningAreaSize.height()));
 
         // If one of the values is auto we have to use the appropriate