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

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

Index: third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp b/third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp
index 617f3b6a6a78fd72a804d7f5c48bde202b4ea30a..1159c84e1b012764d74b5277d8d6c1b2add504d7 100644
--- a/third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp
+++ b/third_party/WebKit/Source/core/layout/svg/SVGTextLayoutEngine.cpp
@@ -172,14 +172,14 @@ void SVGTextLayoutEngine::beginTextPathLayout(SVGInlineFlowBox* flowBox)
 
     m_inPathLayout = true;
     LayoutSVGTextPath* textPath = &toLayoutSVGTextPath(flowBox->layoutObject());
-
     Path path = textPath->layoutPath();
     if (path.isEmpty())
         return;
     m_textPathCalculator = new Path::PositionCalculator(path);
     m_textPathStartOffset = textPath->startOffset();
     m_textPathLength = path.length();
-    if (m_textPathStartOffset > 0 && m_textPathStartOffset <= 1)
+    if (textPath->isPercentageForStartOffset()

[fs, 2016/01/18 12:57:49]

I'd suggest that you instead pass m_textPathLength to startOffset() and do the
computation/resolution within that function. It'd probably be better to let
SVGLengthContext be able to handle this, but that would require some
refactoring.

+        && m_textPathStartOffset > 0 && m_textPathStartOffset <= 1)
         m_textPathStartOffset *= m_textPathLength;
 
     SVGTextPathChunkBuilder textPathChunkLayoutBuilder;