fix #28008, fix #28009 implement FutureOr<T>

pkg/dev_compiler/tool/sdk_expected_errors.txt

Index: pkg/dev_compiler/tool/sdk_expected_errors.txt
diff --git a/pkg/dev_compiler/tool/sdk_expected_errors.txt b/pkg/dev_compiler/tool/sdk_expected_errors.txt
index c3223fac471b41450e588ade9eb73fe55e0a5cb9..fac58a40a0a6f43d3ff3c30c4c542f48f84df8e2 100644
--- a/pkg/dev_compiler/tool/sdk_expected_errors.txt
+++ b/pkg/dev_compiler/tool/sdk_expected_errors.txt
@@ -10,7 +10,9 @@
 [error] Only redirecting factory constructors can be declared to be 'const'. (dart:core/string.dart, line 156, col 9)
 [error] Const constructors can't throw exceptions. (dart:core/string.dart, line 157, col 5)
 [error] Couldn't infer type parameter 'S'; 'RandomAccessFile' must be of type 'File'. (dart:io/file_impl.dart, line 216, col 19)
-[error] The argument type '([dynamic]) → void' can't be assigned to the parameter type '(_ConnectionInfo) → dynamic'. (dart:io/http_impl.dart, line 1633, col 19)
+[error] The argument type '(RandomAccessFile) → Future<RandomAccessFile>' can't be assigned to the parameter type '(RandomAccessFile) → FutureOr<File>'. (dart:io/file_impl.dart, line 216, col 24)
+[error] The return type 'Future' isn't a 'FutureOr<File>', as defined by the method ''. (dart:io/file_impl.dart, line 545, col 14)
+[error] The argument type '([dynamic]) → void' can't be assigned to the parameter type '(_ConnectionInfo) → FutureOr<void>'. (dart:io/http_impl.dart, line 1633, col 19)
 [error] The return type 'StreamSubscription<int>' isn't a 'StreamSubscription<List<int>>', as defined by the method 'listen'. (dart:io/http_parser.dart, line 208, col 14)
 [error] The argument type '(List<int>) → void' can't be assigned to the parameter type '(int) → void'. (dart:io/http_parser.dart, line 209, col 19)
 [error] Couldn't infer type parameter 'V'; 'Object' must be of type 'String'. (dart:io/io_resource_info.dart, line 27, col 7)
@@ -26,12 +28,13 @@
 [error] Couldn't infer type parameter 'V'; 'Object' must be of type 'String'. (dart:io/io_resource_info.dart, line 159, col 5)
 [error] The element type 'int' can't be assigned to the map value type 'String'. (dart:io/io_resource_info.dart, line 161, col 13)
 [error] The element type 'double' can't be assigned to the map value type 'String'. (dart:io/io_resource_info.dart, line 164, col 20)
-[error] The argument type '([dynamic]) → void' can't be assigned to the parameter type '(RawSocket) → dynamic'. (dart:io/secure_socket.dart, line 591, col 28)
+[error] The argument type '([dynamic]) → void' can't be assigned to the parameter type '(RawSocket) → FutureOr<void>'. (dart:io/secure_socket.dart, line 591, col 28)
 [error] The argument type 'List' can't be assigned to the parameter type 'Iterable<int>'. (dart:io/secure_socket.dart, line 1129, col 23)
 [error] Undefined name 'lineMode'. (dart:io/stdio.dart, line 64, col 10)
 [error] The name 'echoMode=' is already defined. (dart:io/stdio.dart, line 126, col 12)
 [error] The name 'lineMode=' is already defined. (dart:io/stdio.dart, line 145, col 12)
 [error] Couldn't infer type parameter 'S'; 'dynamic' must be of type 'WebSocket'. (dart:io/websocket_impl.dart, line 469, col 10)
+[error] The argument type '(String) → Future<dynamic>' can't be assigned to the parameter type '(dynamic) → FutureOr<WebSocket>'. (dart:io/websocket_impl.dart, line 469, col 15)
 [error] Invalid override. The type of 'JsArray.[]=' ('(Object, E) → void') isn't a subtype of 'JsObject.[]=' ('(Object, dynamic) → dynamic'). (dart:js, line 363, col 3)
 [warning] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dart:_js_helper/regexp_helper.dart, line 140, col 43)
 [warning] Unsafe implicit cast from 'List<dynamic>' to 'List<String>'. This usually indicates that type information was lost and resulted in 'dynamic' and/or a place that will have a failure at runtime. (dart:_js_helper/regexp_helper.dart, line 152, col 43)