Fix getComputedStyle background-position to output calc values

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index 940b6a059bdc7bb1787faadf0015652220d254f8..55a9462fc443cc3c9265a57bfeb82efe98b2437d 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -562,6 +562,8 @@ static PassRefPtr<CSSValue> zoomAdjustedPixelValueForLength(const Length& length
 {
     if (length.isFixed())
         return zoomAdjustedPixelValue(length.value(), style);
+    if (length.isCalculated())
+        return cssValuePool().createValue(length, style);
     return cssValuePool().createValue(length);

[alancutter (OOO until 2018), 2013/10/08 11:20:08]

The "if (length.isCalculated())" is not required here as
CSSPrimitiveValue::create(length, style) handles calc already.
This can just become "cssValuePool().createValue(length, style);".

 }