Make skpinfo able to inspect SK_PICT_TYPEFACE_TAG blocks

src/core/SkFontDescriptor.h

Index: src/core/SkFontDescriptor.h
diff --git a/src/core/SkFontDescriptor.h b/src/core/SkFontDescriptor.h
index 21fecdc416287278d7585813fc18fe9403e09a31..095ecce60a2e80af0f25a9bb702a6066a7189fb7 100644
--- a/src/core/SkFontDescriptor.h
+++ b/src/core/SkFontDescriptor.h
@@ -51,7 +51,7 @@ class SkFontDescriptor : SkNoncopyable {
 public:
     SkFontDescriptor(SkTypeface::Style = SkTypeface::kNormal);
     // Does not affect ownership of SkStream.
-    SkFontDescriptor(SkStream*);
+    static bool Deserialize(SkStream*, SkFontDescriptor* result);
 
     void serialize(SkWStream*);