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

Source/core/svg/SVGLengthContext.h

 /*
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGLengthContext_h
 #define SVGLengthContext_h
 
 #include "core/svg/SVGUnitTypes.h"
+#include "platform/Length.h"
 #include "platform/geometry/FloatRect.h"
 
 namespace blink {
 
 class ExceptionState;
 class SVGElement;
 class SVGLength;
 
 enum SVGLengthType {
     LengthTypeUnknown = 0,
@@ skipping 23 matching lines @@
     template<typename T>
     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
     {
         return SVGLengthContext::resolveRectangle(context, type, viewport, context->x()->currentValue(), context->y()->currentValue(), context->width()->currentValue(), context->height()->currentValue());
     }
 
     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, PassRefPtrWillBeRawPtr<SVGLength> x, PassRefPtrWillBeRawPtr<SVGLength> y, PassRefPtrWillBeRawPtr<SVGLength> width, PassRefPtrWillBeRawPtr<SVGLength> height);
     static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, PassRefPtrWillBeRawPtr<SVGLength> x, PassRefPtrWillBeRawPtr<SVGLength> y);
     static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, PassRefPtrWillBeRawPtr<SVGLength>);
 
+    float valueForLength(const Length&, SVGLengthMode = LengthModeOther);
+
     float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit, ExceptionState&) const;

[fs, 2015/02/06 12:28:53]

If https://codereview.chromium.org/901193002/ lands before this, it's possible
you get a conflict here and in the .cpp file. Should be a trivial modify-add
thing though.

     float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit, ExceptionState&) const;
 
     bool determineViewport(FloatSize&) const;
 
 private:
     float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionState&) const;
     float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionState&) const;
     static float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, const FloatSize& viewportSize);
     static float convertValueFromPercentageToUserUnits(const SVGLength& value, const FloatSize& viewportSize);
 
     float convertValueFromUserUnitsToEMS(float value, ExceptionState&) const;
     float convertValueFromEMSToUserUnits(float value, ExceptionState&) const;
 
     float convertValueFromUserUnitsToEXS(float value, ExceptionState&) const;
     float convertValueFromEXSToUserUnits(float value, ExceptionState&) const;
 
     RawPtrWillBeMember<const SVGElement> m_context;
 };
 
 } // namespace blink
 
 #endif // SVGLengthContext_h