Implement some missed methods for summary2 support

Change-Id: I18cbec26512c4d660b6dbc3ea1e5325ff032a8d2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113753
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>

https://dart.googlesource.com/sdk/+/56b3dede78f91d372a1f573848dd7dcaec84d62f
diff --git a/commits.json b/commits.json
index 70f4ebc..24f0838 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"df178fd936c019e0743444f9bb4eece89564c2d4",
   "external/github.com/flutter/flutter":"4d81b0c9708f57e545e96f0e6817f5eab3fc68ee",
-  "sdk":"209c6f8ab93cbbe810a786bb5b78301d27ec26ab"
+  "sdk":"56b3dede78f91d372a1f573848dd7dcaec84d62f"
 }
\ No newline at end of file