Sync SVG interfaces with the specs

Source/core/svg/SVGTextContentElement.idl

Index: Source/core/svg/SVGTextContentElement.idl
diff --git a/Source/core/svg/SVGTextContentElement.idl b/Source/core/svg/SVGTextContentElement.idl
index bfd15879ccbc54dcbc929cad59856c57ae012e33..c2a284fc35ec4c18c456c821dcf443fa49dd907f 100644
--- a/Source/core/svg/SVGTextContentElement.idl
+++ b/Source/core/svg/SVGTextContentElement.idl
@@ -23,6 +23,8 @@
  * 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 {
@@ -36,11 +38,12 @@
 
     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);
 };