Move annotations to canvas virtual (patchset #8 id:140001 of https://codereview.chromium.org/1744103002/ )"

Need to land chrome change first https://codereview.chromium.org/1766723003/

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1758023003

TBR=

Review URL: https://codereview.chromium.org/1758023003
diff --git a/src/core/SkReadBuffer.h b/src/core/SkReadBuffer.h
index 3d6dd36..b9b3094 100644
--- a/src/core/SkReadBuffer.h
+++ b/src/core/SkReadBuffer.h
@@ -60,6 +60,7 @@
         kBitmapSourceFilterQuality_Version = 41,
         kPictureShaderHasPictureBool_Version = 42,
         kHasDrawImageOpCodes_Version       = 43,
+        kAnnotationsMovedToCanvas_Version  = 44,
     };
 
     /**