Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

runtime/bin/process_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 @patch class _WindowsCodePageDecoder {
   @patch static String _decodeBytes(List<int> bytes)
       native "SystemEncodingToString";
 }
 
 
@@ skipping 107 matching lines @@
     });
   }
 
   void _cancel() {
     if (_id != null) {
       _clearSignalHandler(signal._signalNumber);
       _id = null;
     }
   }
 
-  @patch static _setSignalHandler(int signal)
+  static _setSignalHandler(int signal)
       native "Process_SetSignalHandler";
-  @patch static int _clearSignalHandler(int signal)
+  static int _clearSignalHandler(int signal)
       native "Process_ClearSignalHandler";
 }
 
 Function _getWatchSignalInternal() => _ProcessUtils._watchSignalInternal;
 
 
 @patch class _ProcessUtils {
   @patch static void _exit(int status) native "Process_Exit";
   @patch static void _setExitCode(int status)
       native "Process_SetExitCode";
@@ skipping 454 matching lines @@
       Encoding stderrEncoding) {
   var process = new _ProcessImpl(executable,
                                  arguments,
                                  workingDirectory,
                                  environment,
                                  includeParentEnvironment,
                                  runInShell,
                                  ProcessStartMode.NORMAL);
   return process._runAndWait(stdoutEncoding, stderrEncoding);
 }