pdfviewer: make pdfviewer compile on mac

Review URL: https://codereview.chromium.org/23163007

git-svn-id: http://skia.googlecode.com/svn/trunk@10721 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/SkPdfUtils.h b/experimental/PdfViewer/SkPdfUtils.h
index 35c2cea..31dfc0b 100644
--- a/experimental/PdfViewer/SkPdfUtils.h
+++ b/experimental/PdfViewer/SkPdfUtils.h
@@ -3,6 +3,7 @@
 
 #include "SkMatrix.h"
 #include "SkRect.h"
+#include "SkPdfConfig.h"
 
 class SkPdfArray;
 class SkPdfContext;