Separate and update PDF_DIFF_TRACE_IN_PNG

experimental/PdfViewer/src/SkPdfContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPdfContext.h"
 #include "SkPdfNativeDoc.h"
 #include "SkPdfReporter.h"
@@ skipping 106 matching lines @@
         //                and report where the error was triggered
         SkPdfReport(kCodeWarning_SkPdfIssueSeverity, kNYI_SkPdfIssue, token.fKeyword, NULL,
                     fPdfContext);
         return kIgnoreError_SkPdfResult;
     }
     return kOK_SkPdfResult;
 }
 
 void PdfMainLooper::loop() {
     PdfToken token;
-    // readToken defined in SkPdfTokenLooper.h
-    while (readToken(fTokenizer, &token)) {
+    while (fTokenizer->readToken(&token, true)) {
         this->consumeToken(token);
     }
 }