Add flag to guard upcoming picture API change

NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2620513002
Cr-Commit-Position: refs/heads/master@{#441952}

skia/config/SkUserConfig.h

@@ -216,6 +216,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #   define SK_DISABLE_COLOR_XFORM_PIPELINE
 #endif
 
+#ifndef    SK_USE_LEGACY_MAKE_PICTURE_API
+#   define SK_USE_LEGACY_MAKE_PICTURE_API
+#endif
+
 #ifndef    SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
 #   define SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
 #endif