Sync SVG interfaces with the specs

Source/core/svg/SVGTextContentElement.idl

 /*
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// http://www.w3.org/TR/SVG2/text.html#InterfaceSVGTextContentElement
+
 [
     TypeChecking=Interface,
 ] interface SVGTextContentElement : SVGGraphicsElement {
     // lengthAdjust Types
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVG1DOM] const unsigned short LENGTHADJUST_UNKNOWN          = 0;
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVG1DOM] const unsigned short LENGTHADJUST_SPACING          = 1;
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVG1DOM] const unsigned short LENGTHADJUST_SPACINGANDGLYPHS = 2;
 
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVG1DOM] readonly attribute SVGAnimatedLength      textLength;
     [RuntimeEnabled=SVG1DOM, MeasureAs=SVG1DOM] readonly attribute SVGAnimatedEnumeration lengthAdjust;
 
     long getNumberOfChars();
     float getComputedTextLength();
-    [RaisesException] float getSubStringLength(unsigned long offset, unsigned long length);
-    [RaisesException] SVGPoint getStartPositionOfChar(unsigned long offset);
-    [RaisesException] SVGPoint getEndPositionOfChar(unsigned long offset);
-    [RaisesException] SVGRect getExtentOfChar(unsigned long offset);
-    [RaisesException] float getRotationOfChar(unsigned long offset);
+    [RaisesException] float getSubStringLength(unsigned long charnum, unsigned long nchars);
+    // TODO(philipj): SVGPoint/SVGRect should be DOMPoint/DOMRect.
+    [RaisesException] SVGPoint getStartPositionOfChar(unsigned long charnum);
+    [RaisesException] SVGPoint getEndPositionOfChar(unsigned long charnum);
+    [RaisesException] SVGRect getExtentOfChar(unsigned long charnum);
+    [RaisesException] float getRotationOfChar(unsigned long charnum);
     [RaisesException] long getCharNumAtPosition(SVGPoint point);
-    [RaisesException] void selectSubString(unsigned long offset, unsigned long length);
+    [RaisesException] void selectSubString(unsigned long charnum, unsigned long nchars);
 };