Update code to use helper function for better readability/searching.

src/ports/SkXMLParser_expat.cpp

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkXMLParser.h"
@@ skipping 95 matching lines @@
     if (error == XML_STATUS_ERROR) {
         reportError(p);
         success = false;
     }
     XML_ParserFree(p);
     return success;
 }
 
 bool SkXMLParser::parse(SkStream& input)
 {
-    size_t          len = input.read(NULL, 0);
+    size_t          len = input.getLength();
     SkAutoMalloc    am(len);
     char*           doc = (char*)am.get();
 
     input.rewind();
     size_t  len2 = input.read(doc, len);
     SkASSERT(len2 == len);
 
     return this->parse(doc, len2);
 }
 
 void SkXMLParser::reportError(void* p)
 {
     XML_Parser parser = (XML_Parser) p;
     if (fError && parser) {
         fError->fNativeCode = XML_GetErrorCode(parser);
         fError->fLineNumber = XML_GetCurrentLineNumber(parser);
     }
 }
 
 void SkXMLParser::GetNativeErrorString(int error, SkString* str)
 {
     if (str)
         str->set(XML_ErrorString((XML_Error) error));
 }