Enable flattening of SkRecordedDrawable

src/core/SkReadBuffer.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 SkReadBuffer_DEFINED
 #define SkReadBuffer_DEFINED
 
@@ skipping 186 matching lines @@
     /**
      *  Call this with a pre-loaded array of Factories, in the same order as
      *  were created/written by the writer. SkPicture uses this.
      */
     void setFactoryPlayback(SkFlattenable::Factory array[], int count) {
         fFactoryArray = array;
         fFactoryCount = count;
     }
 
     /**
+     *  If we are using this ReadBuffer to unflatten drawable, this function should
+     *  be called.  It will register the default unflattening proc for SkRecordedDrawable.
+     */
+    void initDrawableFactories();
+
+    /**
      *  For an input flattenable (specified by name), set a custom factory proc
      *  to use when unflattening.  Will make a copy of |name|.
      *
      *  If the global registry already has a default factory for the flattenable,
      *  this will override that factory.  If a custom factory has already been
      *  set for the flattenable, this will override that factory.
      *
      *  Custom factories can be removed by calling setCustomFactory("...", nullptr).
      */
     void setCustomFactory(const SkString& name, SkFlattenable::Factory factory) {
@@ skipping 60 matching lines @@
     SkPicture::InstallPixelRefProc fBitmapDecoder;
 
 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT
     // Debugging counter to keep track of how many bitmaps we
     // have decoded.
     int fDecodedBitmapIndex;
 #endif // DEBUG_NON_DETERMINISTIC_ASSERT
 };
 
 #endif // SkReadBuffer_DEFINED