[svg2] Make 'x' and 'y' presentation attributes

Source/core/svg/SVGLengthContext.cpp

Index: Source/core/svg/SVGLengthContext.cpp
diff --git a/Source/core/svg/SVGLengthContext.cpp b/Source/core/svg/SVGLengthContext.cpp
index 40c86bb6f21d2f797a8a86e063768fa856c38f13..39c41c2712dc87b656e83ce815a1e45c58db7ded 100644
--- a/Source/core/svg/SVGLengthContext.cpp
+++ b/Source/core/svg/SVGLengthContext.cpp
@@ -32,10 +32,25 @@
 #include "core/rendering/svg/RenderSVGRoot.h"
 #include "core/rendering/svg/RenderSVGViewportContainer.h"
 #include "core/svg/SVGSVGElement.h"
+#include "platform/LengthFunctions.h"
 #include "platform/fonts/FontMetrics.h"
 
 namespace blink {
 
+static inline float dimensionForLengthMode(SVGLengthMode mode, const FloatSize& viewportSize)
+{
+    switch (mode) {
+    case LengthModeWidth:
+        return viewportSize.width();
+    case LengthModeHeight:
+        return viewportSize.height();
+    case LengthModeOther:
+        return sqrtf(viewportSize.diagonalLengthSquared() / 2);
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
 SVGLengthContext::SVGLengthContext(const SVGElement* context)
     : m_context(context)
 {
@@ -91,6 +106,20 @@ float SVGLengthContext::resolveLength(const SVGElement* context, SVGUnitTypes::S
     return x->valueAsPercentage();
 }
 
+float SVGLengthContext::valueForLength(const Length& length, SVGLengthMode mode)
+{
+    if (length.isAuto())
+        return 0;
+
+    FloatSize viewportSize;
+    determineViewport(viewportSize);
+
+    if (length.isPercent())
+        return convertValueFromPercentageToUserUnits(length.value(), mode, viewportSize) / 100;
+
+    return floatValueForLength(length, dimensionForLengthMode(mode, viewportSize));
+}
+
 float SVGLengthContext::convertValueToUserUnits(float value, SVGLengthMode mode, SVGLengthType fromUnit, ExceptionState& exceptionState) const
 {
     switch (fromUnit) {
@@ -155,20 +184,6 @@ float SVGLengthContext::convertValueFromUserUnits(float value, SVGLengthMode mod
     return 0;
 }
 
-static inline float dimensionForLengthMode(SVGLengthMode mode, const FloatSize& viewportSize)
-{
-    switch (mode) {
-    case LengthModeWidth:
-        return viewportSize.width();
-    case LengthModeHeight:
-        return viewportSize.height();
-    case LengthModeOther:
-        return sqrtf(viewportSize.diagonalLengthSquared() / 2);
-    }
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
 float SVGLengthContext::convertValueFromUserUnitsToPercentage(float value, SVGLengthMode mode, ExceptionState& exceptionState) const
 {
     FloatSize viewportSize;