[core libs] add dart:developer, dart:js_util, and dart:wasm to the set of validated libraries

Change-Id: Id54af09f7b7559c5eb751db822aba8cd6b413559
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/241160
Reviewed-by: Jonas Termansen <sortie@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>

sdk/lib/developer/timeline.dart

@@ -4,6 +4,9 @@
 
 part of dart.developer;
 
+// Examples can assume:
+// void doSomething() {}
+
 const bool _hasTimeline =
     const bool.fromEnvironment("dart.developer.timeline", defaultValue: true);
 

sdk/lib/js_util/js_util.dart

@@ -17,6 +17,10 @@ import 'dart:async' show Completer;
 import 'dart:_js_helper'
     show convertDartClosureToJS, assertInterop, assertInteropArgs;
 
+// Examples can assume:
+// class JS { const JS(); }
+// class Promise<T> {}
+
 /// Recursively converts a JSON-like collection to JavaScript compatible
 /// representation.
 ///
@@ -305,9 +309,11 @@ class NullRejectionException implements Exception {
 /// @JS()
 /// external Promise<num> get threePromise; // Resolves to 3
 ///
-/// final Future<num> threeFuture = promiseToFuture(threePromise);
+/// void main() async {
+///   final Future<num> threeFuture = promiseToFuture(threePromise);
 ///
-/// final three = await threeFuture; // == 3
+///   final three = await threeFuture; // == 3
+/// }
 /// ```
 Future<T> promiseToFuture<T>(Object jsPromise) {
   final completer = Completer<T>();

tools/bots/test_matrix.json

@@ -3682,14 +3682,17 @@
           "script": "out/ReleaseX64/dart-sdk/bin/dart",
           "arguments": [
             "tools/verify_docs/bin/verify_docs.dart",
-            "sdk/lib/_http",
-            "sdk/lib/_internal",
-            "sdk/lib/cli",
-            "sdk/lib/convert",
-            "sdk/lib/ffi",
-            "sdk/lib/js",
-            "sdk/lib/math",
-            "sdk/lib/mirrors"
+            "dart:_http",
+            "dart:_internal",
+            "dart:cli",
+            "dart:convert",
+            "dart:developer",
+            "dart:ffi",
+            "dart:js",
+            "dart:js_util",
+            "dart:math",
+            "dart:mirrors",
+            "dart:wasm"
           ]
         },
         {