Add SkBlurDrawLooper::Make(SkColor4f, SkColorSpace)

Bug: b/120904891

This will allow adding android.graphics.Paint#setShadowLayer(
    float radius, float dx, float dy, @ColorLong long shadowColor).

Change-Id: Ic9256b10c82b56847802f209cf82b4e5c07a9069
Reviewed-on: https://skia-review.googlesource.com/c/182762
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/include/effects/SkBlurDrawLooper.h b/include/effects/SkBlurDrawLooper.h
index 08e7766..13f5b8a 100644
--- a/include/effects/SkBlurDrawLooper.h
+++ b/include/effects/SkBlurDrawLooper.h
@@ -16,6 +16,8 @@
  *  its original position.
  */
 namespace SkBlurDrawLooper {
+    sk_sp<SkDrawLooper> SK_API Make(SkColor4f color, SkColorSpace* cs,
+            SkScalar sigma, SkScalar dx, SkScalar dy);
     sk_sp<SkDrawLooper> SK_API Make(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy);
 };