[dart:io] Adds ProcessInfo.{max,current}Rss. Adds OS::MaxRSS on Fuchsia.

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 147 matching lines @@
   }
 
   static Stream<ProcessSignal> _watchSignalInternal(ProcessSignal signal) {
     if (_signalControllers[signal._signalNumber] == null) {
       _signalControllers[signal._signalNumber] = new _SignalController(signal);
     }
     return _signalControllers[signal._signalNumber].stream;
   }
 }
 
+@patch
+class ProcessInfo {
+  @patch
+  static int get maxRss {
+    var result = _maxRss();
+    if (result is OSError) {
+      throw result;
+    }
+    return result;
+  }
+
+  @patch
+  static int get currentRss {
+    var result = _currentRss();
+    if (result is OSError) {
+      throw result;
+    }
+    return result;
+  }
+
+  static _maxRss() native "ProcessInfo_MaxRSS";
+  static _currentRss() native "ProcessInfo_CurrentRSS";
+}
+
 class _ProcessStartStatus {
   int _errorCode; // Set to OS error code if process start failed.
   String _errorMessage; // Set to OS error message if process start failed.
 }
 
 // The NativeFieldWrapperClass1 can not be used with a mixin, due to missing
 // implicit constructor.
 class _ProcessImplNativeWrapper extends NativeFieldWrapperClass1 {}
 
 class _ProcessImpl extends _ProcessImplNativeWrapper implements Process {
@@ skipping 409 matching lines @@
   var process = new _ProcessImpl(
       executable,
       arguments,
       workingDirectory,
       environment,
       includeParentEnvironment,
       runInShell,
       ProcessStartMode.NORMAL);
   return process._runAndWait(stdoutEncoding, stderrEncoding);
 }