SkPDF: Factor SkPDFCatalog into SkPDFObjNumMap and SkPDFSubstituteMap

src/pdf/SkPDFGraphicState.h

Index: src/pdf/SkPDFGraphicState.h
diff --git a/src/pdf/SkPDFGraphicState.h b/src/pdf/SkPDFGraphicState.h
index dc41fc62297ecda08aee60e586f8b10f24659934..85a324b1913801217f5573b303b32c27ef7ad9af 100644
--- a/src/pdf/SkPDFGraphicState.h
+++ b/src/pdf/SkPDFGraphicState.h
@@ -37,7 +37,9 @@ public:
 
     // Override emitObject so that we can populate the dictionary on
     // demand.
-    virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog);
+    virtual void emitObject(SkWStream* stream,
+                            const SkPDFObjNumMap& objNumMap,
+                            const SkPDFSubstituteMap& substitutes);
 
     /** Get the graphic state for the passed SkPaint. The reference count of
      *  the object is incremented and it is the caller's responsibility to