Separate and update PDF_DIFF_TRACE_IN_PNG

experimental/PdfViewer/src/SkPdfContext.cpp

Index: experimental/PdfViewer/src/SkPdfContext.cpp
diff --git a/experimental/PdfViewer/src/SkPdfContext.cpp b/experimental/PdfViewer/src/SkPdfContext.cpp
index 6904e344b98d8fb228f95ecbd1c806a6b21a09ec..c2162556bb41932051fa572d44dcc9ec448750b3 100644
--- a/experimental/PdfViewer/src/SkPdfContext.cpp
+++ b/experimental/PdfViewer/src/SkPdfContext.cpp
@@ -126,10 +126,7 @@ SkPdfResult PdfMainLooper::consumeToken(PdfToken& token) {
 
 void PdfMainLooper::loop() {
     PdfToken token;
-    // readToken defined in SkPdfTokenLooper.h
-    // FIXME (scroggo): Remove readToken (which just calls fTokenizer->readToken, plus draws
-    // some debugging info with PDF_DIFF_TRACE_IN_PNG)
-    while (readToken(fTokenizer, &token)) {
+    while (fTokenizer->readToken(&token, true)) {
         this->consumeToken(token);
     }
 }