Add support for serializing/deserializing of SkDrawable

src/core/SkPictureFlat.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkPictureFlat_DEFINED
 #define SkPictureFlat_DEFINED
 
 
@@ skipping 13 matching lines @@
     CLIP_REGION,
     CLIP_RECT,
     CLIP_RRECT,
     CONCAT,
     DRAW_BITMAP,
     DRAW_BITMAP_MATRIX, // deprecated, M41 was last Chromium version to write this to an .skp
     DRAW_BITMAP_NINE,
     DRAW_BITMAP_RECT,
     DRAW_CLEAR,
     DRAW_DATA,
+    DRAW_DRAWABLE,
+    DRAW_DRAWABLE_MATRIX,
     DRAW_OVAL,
     DRAW_PAINT,
     DRAW_PATH,
     DRAW_PICTURE,
     DRAW_POINTS,
     DRAW_POS_TEXT,
     DRAW_POS_TEXT_TOP_BOTTOM, // fast variant of DRAW_POS_TEXT
     DRAW_POS_TEXT_H,
     DRAW_POS_TEXT_H_TOP_BOTTOM, // fast variant of DRAW_POS_TEXT_H
     DRAW_RECT,
@@ skipping 504 matching lines @@
     bool fReady;
 
     // For index -> SkFlatData.  0-based, while all indices in the API are 1-based.  Careful!
     SkTDArray<const SkFlatData*> fIndexedData;
 
     // For SkFlatData -> cached SkFlatData, which has index().
     SkTDynamicHash<SkFlatData, SkFlatData, SkFlatData::HashTraits> fHash;
 };
 
 #endif