SkTextBlob plumbing

include/core/SkTextBlob.h

Index: include/core/SkTextBlob.h
diff --git a/include/core/SkTextBlob.h b/include/core/SkTextBlob.h
index d1b2e0fe1b94f83159869251de19fadc79d5e395..b630f14dbfa3f118a580d4f535eed015c8548fba 100644
--- a/include/core/SkTextBlob.h
+++ b/include/core/SkTextBlob.h
@@ -13,6 +13,9 @@
 #include "SkTArray.h"
 #include "SkTDArray.h"
 
+class SkReadBuffer;
+class SkWriteBuffer;
+
 /** \class SkTextBlob
 
     SkTextBlob combines multiple text runs into an immutable, ref-counted structure.
@@ -67,7 +70,13 @@ private:
 
     SkTextBlob(uint16_t* glyphs, SkScalar* pos, const SkTArray<Run>* runs, const SkRect& bounds);
 
+    void flatten(SkWriteBuffer&) const;
+    static const SkTextBlob* CreateFromBuffer(SkReadBuffer&);
+
+    static unsigned ScalarsPerGlyph(GlyphPositioning pos);
+
     friend class SkCanvas;
+    friend class SkPictureData;
     friend class SkTextBlobBuilder;
     friend class TextBlobTester;