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

runtime/bin/process.h

 // Copyright (c) 2012, 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.
 
 #ifndef RUNTIME_BIN_PROCESS_H_
 #define RUNTIME_BIN_PROCESS_H_
 
 #include <errno.h>
 
 #include "bin/builtin.h"
@@ skipping 128 matching lines @@
   static intptr_t CurrentProcessId();
 
   static intptr_t SetSignalHandler(intptr_t signal);
   static void ClearSignalHandler(intptr_t signal);
   static void ClearAllSignalHandlers();
 
   static Dart_Handle GetProcessIdNativeField(Dart_Handle process,
                                              intptr_t* pid);
   static Dart_Handle SetProcessIdNativeField(Dart_Handle process, intptr_t pid);
 
+  static int64_t CurrentRSS();
+  static int64_t MaxRSS();
+
  private:
   static int global_exit_code_;
   static Mutex* global_exit_code_mutex_;
   static ExitHook exit_hook_;
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Process);
 };
 
 
@@ skipping 202 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BufferList);
 };
 #endif  // defined(HOST_OS_ANDROID) ...
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_PROCESS_H_