Fix incorrect handling of small non-percentage value for 'startOffset' on <textPath>

third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp

Index: third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp b/third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp
index a243f639f86a085e3d5f00604ec89c8fbf8dde30..6e667f17148b95012d87d732b0ac54c22de9005f 100644
--- a/third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/LayoutSVGTextPath.cpp
@@ -57,9 +57,18 @@ Path LayoutSVGTextPath::layoutPath() const
     return pathData;
 }
 
-float LayoutSVGTextPath::startOffset() const
+static inline bool isPercentageForStartOffset(const LayoutObject* layoutObject)
 {
-    return toSVGTextPathElement(node())->startOffset()->currentValue()->valueAsPercentage();
+    return toSVGTextPathElement(layoutObject->node())->startOffset()->currentValue()->typeWithCalcResolved() == CSSPrimitiveValue::UnitType::Percentage;
+}
+
+float LayoutSVGTextPath::calculateStartOffset(float length) const
+{
+    float textPathStartOffset = toSVGTextPathElement(node())->startOffset()->currentValue()->valueAsPercentage();
+    if (isPercentageForStartOffset(this)) {

[fs, 2016/01/28 15:20:34]

This is unnecessarily complicated, just do:

const SVGLength& startOffset =
*toSVGTextPathElement(node())->startOffset()->currentValue();
float textPath...
if (startOffset.typeWithCalcResolved() ==
CSSPrimitiveValue::UnitType::Percentage)
    ...

or so instead.

+        textPathStartOffset *= length;
+    }
+    return textPathStartOffset;
 }
 
 } // namespace blink