[skrive] Add dm source

Change-Id: I09b8f8bb95dac443b64d85340db12f59f8977654
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/299143
Auto-Submit: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 1a0e55b..b79a83d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1862,6 +1862,7 @@
         ":tests",
         ":tool_utils",
         ":trace",
+        "experimental/skrive",
         "modules/skottie",
         "modules/skottie:utils",
       ]