Observatory: Report peak process memory usage.

runtime/vm/os.h

 // Copyright (c) 2011, 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 VM_OS_H_
 #define VM_OS_H_
 
 #include "vm/globals.h"
 
 // Forward declarations.
@@ skipping 82 matching lines @@
   // the platform doesn't care. Guaranteed to be a power of two.
   static intptr_t PreferredCodeAlignment();
 
   // Returns true if StackFrameIterator can be used from an isolate that isn't
   // the calling thread's current isolate.
   static bool AllowStackFrameIteratorFromAnotherThread();
 
   // Returns number of available processor cores.
   static int NumberOfAvailableProcessors();
 
+  // Returns the maximium resident set size of this process.
+  static uintptr_t MaxRSS();
+
   // Sleep the currently executing thread for millis ms.
   static void Sleep(int64_t millis);
 
   // Sleep the currently executing thread for micros microseconds.
   static void SleepMicros(int64_t micros);
 
   // Debug break.
   static void DebugBreak();
 
   // Not all platform support strndup.
@@ skipping 51 matching lines @@
   static void Shutdown();
 
   static void Abort();
 
   static void Exit(int code);
 };
 
 }  // namespace dart
 
 #endif  // VM_OS_H_