[dart2js] Fix extension methods in record_use

Apply a workaround for dropping the receiver. This makes the behavior
consistent with the VM.
Closes: https://github.com/dart-lang/native/issues/2926

We should find a better solution for extension methods that also
records the name of the extension and the type its on and the original
method name. This will be addressed later.
Bug: https://github.com/dart-lang/native/issues/2948

Change-Id: Iaa1f6afb82e4a70ed7af8e8ae4bbf92c4776637e
Cq-Include-Trybots: luci.dart.try:pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-mac-release-try,pkg-win-release-arm64-try,pkg-win-release-try,dart2js-linux-chrome-try,dart2js-unit-linux-x64-release-try,dart2wasm-linux-jscm-chrome-try,dart2wasm-linux-optimized-jsc-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/472540
Reviewed-by: Nate Biggs <natebiggs@google.com>

pkg/compiler/lib/src/ssa/codegen.dart

@@ -5,6 +5,8 @@
 import 'dart:collection' show Queue;
 import 'dart:io';
 
+// ignore: implementation_imports
+import 'package:front_end/src/api_prototype/lowering_predicates.dart';
 // ignore: implementation_imports
 import 'package:front_end/src/api_unstable/dart2js.dart'
     show Link, relativizeUri;
@@ -2407,14 +2409,21 @@ class SsaCodeGenerator implements HVisitor<void>, HBlockInformationVisitor {
 
     record_use.Location? location = _recordUseLocation(sourceInformation);
 
+    final name = element.name!;
+    // TODO(https://github.com/dart-lang/native/issues/2948): Record the name of
+    // the extension instead of the desugared name.
+    final isExtensionMethod = hasUnnamedExtensionNamePrefix(name);
     return RecordedCallWithArguments(
       identifier: RecordedIdentifier(
-        name: element.name!,
+        name: name,
         parent: element.enclosingClass?.name,
         uri: relativizeUri(Uri.base, uri, Platform.isWindows),
       ),
       location: location,
-      positionalArguments: arguments.map(_findConstant).toList(),
+      positionalArguments: arguments
+          .skip(isExtensionMethod ? 1 : 0)
+          .map(_findConstant)
+          .toList(),
     );
   }
 

pkg/compiler/test/record_use/record_use_test.dart

@@ -142,7 +142,4 @@ const dart2jsNotSupported = {
   'named_both.dart',
   'named_optional.dart',
   'named_required.dart',
-  // Extension methods are broken.
-  // https://github.com/dart-lang/native/issues/2926
-  'extension.dart',
 };