BUILD.gn: skia_enable_pdf

BUG=skia:

Change-Id: Icf616bec73e81aad97815b519566ff5b9db611e3
Reviewed-on: https://skia-review.googlesource.com/6495
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/tests/PDFGlyphsToUnicodeTest.cpp b/tests/PDFGlyphsToUnicodeTest.cpp
index 0d87cd7d..332520b 100644
--- a/tests/PDFGlyphsToUnicodeTest.cpp
+++ b/tests/PDFGlyphsToUnicodeTest.cpp
@@ -5,11 +5,14 @@
  * found in the LICENSE file.
  */
 
+#include "Test.h"
+
+#ifdef SK_SUPPORT_PDF
+
 #include "SkBitSet.h"
 #include "SkData.h"
 #include "SkPDFMakeToUnicodeCmap.h"
 #include "SkStream.h"
-#include "Test.h"
 
 static const int kMaximumGlyphCount = SK_MaxU16 + 1;
 
@@ -178,3 +181,5 @@
     REPORTER_ASSERT(reporter, stream_equals(buffer2, 0, expectedResult2,
                                             buffer2.bytesWritten()));
 }
+
+#endif