CSS Typed OM: asMatrix for TransformComponent with LengthValue types

third_party/WebKit/Source/core/css/cssom/LengthValue.cpp

Index: third_party/WebKit/Source/core/css/cssom/LengthValue.cpp
diff --git a/third_party/WebKit/Source/core/css/cssom/LengthValue.cpp b/third_party/WebKit/Source/core/css/cssom/LengthValue.cpp
index 637f5076a9d7baa48b920d3c8836f105a2ee2146..786514aa1979893e45e4bd9bd96f4cce7fc22311 100644
--- a/third_party/WebKit/Source/core/css/cssom/LengthValue.cpp
+++ b/third_party/WebKit/Source/core/css/cssom/LengthValue.cpp
@@ -5,9 +5,12 @@
 #include "core/css/cssom/LengthValue.h"
 
 #include "bindings/core/v8/ExceptionState.h"
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSToLengthConversionData.h"
 #include "core/css/cssom/CalcDictionary.h"
 #include "core/css/cssom/SimpleLength.h"
 #include "core/css/cssom/StyleCalcLength.h"
+#include "core/style/ComputedStyle.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
@@ -64,6 +67,23 @@ LengthValue* LengthValue::divide(double x, ExceptionState& exceptionState)
     return divideInternal(x, exceptionState);
 }
 
+double LengthValue::computeLengthPx(ExceptionState& exceptionState) const
+{
+    if (isRelative()) {
+        // TODO: Resolve relative units to a pixel value.
+        exceptionState.throwTypeError("Cannot resolve a relative unit to a pixel value.");
+        return 0;
+    }
+
+    CSSValue* cssValue = toCSSValue();
+    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(cssValue);
+    ComputedStyle* computedStyle = const_cast<ComputedStyle*>(ComputedStyle::create().get());
+    CSSToLengthConversionData conversionData = CSSToLengthConversionData(computedStyle,
+        CSSToLengthConversionData::FontSizes(), CSSToLengthConversionData::ViewportSize(), 1);
+
+    return primitiveValue->CSSPrimitiveValue::computeLength<double>(conversionData);
+}
+
 LengthValue* LengthValue::addInternal(const LengthValue*, ExceptionState&)
 {
     ASSERT_NOT_REACHED();