[ package:dds ] Migrate package:devtools_server functionality under package:dds/devtools_server.dart

Will allow for us to remove dependencies on package:devtools_server in
various packages.

Change-Id: I055cc7bb05d5b4ce0071e3f88a71cb9596e76c74
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/228022
Reviewed-by: Kenzie (Schmoll) Davisson <kenzieschmoll@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>

https://dart.googlesource.com/sdk/+/3b736b846064295f08727b914b65561487a74540
diff --git a/commits.json b/commits.json
index da09fd5..9a799c5 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"70024475f41a7cb311e721bf10d95354510c57ab",
   "external/github.com/flutter/flutter":"5d5958f3588ee1ed25e31445d4b74b2a52c1025d",
-  "sdk":"cbe082885828094489c6af95d19fe3da4920498b"
+  "sdk":"3b736b846064295f08727b914b65561487a74540"
 }
\ No newline at end of file