[PDF] Refactor SkPDFFont to enable font/cmap subsetting.

Patch from Arthur Hsu, original CL: http://codereview.appspot.com/4633050/

Committed: http://code.google.com/p/skia/source/detail?r=1943
Reverted: http://code.google.com/p/skia/source/detail?r=1944

Review URL: http://codereview.appspot.com/4811049

git-svn-id: http://skia.googlecode.com/svn/trunk@1956 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/pdf/SkPDFDocument.h b/include/pdf/SkPDFDocument.h
index 3f171f5..8b472e1 100644
--- a/include/pdf/SkPDFDocument.h
+++ b/include/pdf/SkPDFDocument.h
@@ -81,6 +81,7 @@
     SkTDArray<SkPDFDict*> fPageTree;
     SkRefPtr<SkPDFDict> fDocCatalog;
     SkTDArray<SkPDFObject*> fPageResources;
+    SkTDArray<SkPDFObject*> fSubstitutes;
     int fSecondPageFirstResourceIndex;
 
     SkRefPtr<SkPDFDict> fTrailerDict;