Explicitly friend ::SkPrivateEffectInitializer to flattenables.

include/core/SkFlattenable.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkFlattenable_DEFINED
 #define SkFlattenable_DEFINED
 
 #include "SkRefCnt.h"
 
 class SkReadBuffer;
 class SkWriteBuffer;
 
+class SkPrivateEffectInitializer;
+
 /*
  *  Flattening is straight-forward:
  *      1. call getFactory() so we have a function-ptr to recreate the subclass
  *      2. call flatten(buffer) to write out enough data for the factory to read
  *
  *  Unflattening is easy for the caller: new_instance = factory(buffer)
  *
  *  The complexity of supporting this is as follows.
  *
  *  If your subclass wants to control unflattening, use this macro in your declaration:
@@ skipping 14 matching lines @@
 #define SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END \
     }
 
 #define SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(flattenable) \
     SkFlattenable::Registrar(#flattenable, flattenable::CreateProc, \
                              flattenable::GetFlattenableType());
 
 #define SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(flattenable)    \
     private:                                                                \
     static SkFlattenable* CreateProc(SkReadBuffer&);                        \
-    friend class SkPrivateEffectInitializer;                                \
+    friend class ::SkPrivateEffectInitializer;                              \
     public:                                                                 \
     Factory getFactory() const override { return CreateProc; }
 
 /** For SkFlattenable derived objects with a valid type
     This macro should only be used in base class objects in core
   */
 #define SK_DEFINE_FLATTENABLE_TYPE(flattenable) \
     static Type GetFlattenableType() { \
         return k##flattenable##_Type; \
     }
@@ skipping 54 matching lines @@
 
 private:
     static void InitializeFlattenablesIfNeeded();
 
     friend class SkGraphics;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif