Use double precision in SVGLengthContext::convertValueToUserUnits

third_party/WebKit/Source/core/svg/SVGLengthContext.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 239 matching lines @@
   // real meaning for svg.
   if (length.isIntrinsic())
     return 0;
   return floatValueForLength(length, dimension * zoom) / zoom;
 }
 
 float SVGLengthContext::convertValueToUserUnits(
     float value,
     SVGLengthMode mode,
     CSSPrimitiveValue::UnitType fromUnit) const {
-  float userUnits = value;
+  double userUnits = value;
   switch (fromUnit) {
     case CSSPrimitiveValue::UnitType::Pixels:
     case CSSPrimitiveValue::UnitType::Number:
     case CSSPrimitiveValue::UnitType::Integer:
     case CSSPrimitiveValue::UnitType::UserUnits:
       userUnits = value;
       break;
     case CSSPrimitiveValue::UnitType::Percentage: {
       FloatSize viewportSize;
       if (!determineViewport(viewportSize))
@@ skipping 188 matching lines @@
   const ComputedStyle* rootStyle = rootElementStyle(m_context);
   if (!rootStyle)
     return 0;
 
   CSSToLengthConversionData conversionData = CSSToLengthConversionData(
       style, rootStyle, m_context->document().layoutViewItem(), 1.0f);
   Length length = primitiveValue.convertToLength(conversionData);
   return valueForLength(length, 1.0f, mode);
 }
 }  // namespace blink