[PDF] Add link annotations.

Review URL: https://codereview.appspot.com/6346100

git-svn-id: http://skia.googlecode.com/svn/trunk@4609 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFStream.cpp b/src/pdf/SkPDFStream.cpp
index 49c7156..d113a0b 100644
--- a/src/pdf/SkPDFStream.cpp
+++ b/src/pdf/SkPDFStream.cpp
@@ -14,7 +14,8 @@
 #include "SkStream.h"
 
 static bool skip_compression(SkPDFCatalog* catalog) {
-    return catalog->getDocumentFlags() & SkPDFDocument::kNoCompression_Flag;
+    return SkToBool(catalog->getDocumentFlags() &
+                    SkPDFDocument::kNoCompression_Flags);
 }
 
 SkPDFStream::SkPDFStream(SkStream* stream)