Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

include/core/SkPicture.h

 /*
  * Copyright 2007 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 SkPicture_DEFINED
 #define SkPicture_DEFINED
 
@@ skipping 206 matching lines @@
     // V40: Remove UniqueID serialization from SkImageFilter.
     // V41: Added serialization of SkBitmapSource's filterQuality parameter
     // V42: Added a bool to SkPictureShader serialization to indicate did-we-serialize-a-picture?
     // V43: Added DRAW_IMAGE and DRAW_IMAGE_RECT opt codes to serialized data
     // V44: Move annotations from paint to drawAnnotation
     // V45: Add invNormRotation to SkLightingShader.
     // V46: Add drawTextRSXform
     // V47: Add occluder rect to SkBlurMaskFilter
     // V48: Read and write extended SkTextBlobs.
     // V49: Gradients serialized as SkColor4f + SkColorSpace
+    // V50: SkXfermode -> SkBlendMode
 
     // Only SKPs within the min/current picture version range (inclusive) can be read.
     static const uint32_t     MIN_PICTURE_VERSION = 35;     // Produced by Chrome M39.
-    static const uint32_t CURRENT_PICTURE_VERSION = 49;
+    static const uint32_t CURRENT_PICTURE_VERSION = 50;
 
     static_assert(MIN_PICTURE_VERSION <= 41,
                   "Remove kFontFileName and related code from SkFontDescriptor.cpp.");
 
     static_assert(MIN_PICTURE_VERSION <= 42,
                   "Remove COMMENT API handlers from SkPicturePlayback.cpp");
 
     static_assert(MIN_PICTURE_VERSION <= 43,
                   "Remove SkBitmapSourceDeserializer.");
 
     static_assert(MIN_PICTURE_VERSION <= 45,
                   "Remove decoding of old SkTypeface::Style from SkFontDescriptor.cpp.");
 
     static_assert(MIN_PICTURE_VERSION <= 48,
                   "Remove legacy gradient deserialization code from SkGradientShader.cpp.");
 
     static bool IsValidPictInfo(const SkPictInfo& info);
     static sk_sp<SkPicture> Forwardport(const SkPictInfo&,
                                         const SkPictureData*,
                                         SkReadBuffer* buffer);
 
     SkPictInfo createHeader() const;
     SkPictureData* backport() const;
 
     mutable uint32_t fUniqueID;
 };
 
 #endif