Revert of Delete SkFlattenable::Type

include/core/SkImageFilter.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 SkImageFilter_DEFINED
 #define SkImageFilter_DEFINED
 
@@ skipping 274 matching lines @@
     // "result" and "offset" untouched, and returns true. If the input
     // has a GPU implementation, it will be invoked directly.
     // Otherwise, the filter will be processed in software and
     // uploaded to the GPU.
     bool filterInputGPUDeprecated(int index, SkImageFilter::Proxy* proxy,
                                   const SkBitmap& src, const Context&,
                                   SkBitmap* result, SkIPoint* offset) const;
 #endif
 
     SK_TO_STRING_PUREVIRT()
+    SK_DEFINE_FLATTENABLE_TYPE(SkImageFilter)
 
 protected:
     class Common {
     public:
         /**
          *  Attempt to unflatten the cropRect and the expected number of input filters.
          *  If any number of input filters is valid, pass -1.
          *  If this fails (i.e. corrupt buffer or contents) then return false and common will
          *  be left uninitialized.
          *  If this returns true, then inputCount() is the number of found input filters, each
@@ skipping 181 matching lines @@
  */
 #define SK_IMAGEFILTER_UNFLATTEN_COMMON(localVar, expectedCount)    \
     Common localVar;                                                \
     do {                                                            \
         if (!localVar.unflatten(buffer, expectedCount)) {           \
             return NULL;                                            \
         }                                                           \
     } while (0)
 
 #endif