Gradients are serialized (and can be constructed) as SkColor4f + SkColorSpace

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index c8de7daf84b06b8a2d344a80b1df4cf091fa3822..1dcbcc5b7581aced8d05a128225c8313915c2a4f 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -223,10 +223,11 @@ private:
     // V46: Add drawTextRSXform
     // V47: Add occluder rect to SkBlurMaskFilter
     // V48: Read and write extended SkTextBlobs.
+    // V49: Gradients serialized as SkColor4f + SkColorSpace
 
     // 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 = 48;
+    static const uint32_t CURRENT_PICTURE_VERSION = 49;
 
     static_assert(MIN_PICTURE_VERSION <= 41,
                   "Remove kFontFileName and related code from SkFontDescriptor.cpp.");
@@ -240,6 +241,9 @@ private:
     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*,