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

runtime/bin/process.cc

 // 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.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "bin/process.h"
 
 #include "bin/dartutils.h"
 #include "bin/io_buffer.h"
@@ skipping 348 matching lines @@
         DartUtils::NewInternalError("StringToSystemEncoding failed"));
   }
   uint8_t* buffer = NULL;
   Dart_Handle external_array = IOBuffer::Allocate(system_len, &buffer);
   if (!Dart_IsError(external_array)) {
     memmove(buffer, system_string, system_len);
   }
   Dart_SetReturnValue(args, external_array);
 }
 
+
+void FUNCTION_NAME(ProcessInfo_CurrentRSS)(Dart_NativeArguments args) {
+  int64_t current_rss = Process::CurrentRSS();
+  if (current_rss < 0) {
+    Dart_SetReturnValue(args, DartUtils::NewDartOSError());
+    return;
+  }
+  Dart_SetIntegerReturnValue(args, current_rss);
+}
+
+
+void FUNCTION_NAME(ProcessInfo_MaxRSS)(Dart_NativeArguments args) {
+  int64_t max_rss = Process::MaxRSS();
+  if (max_rss < 0) {
+    Dart_SetReturnValue(args, DartUtils::NewDartOSError());
+    return;
+  }
+  Dart_SetIntegerReturnValue(args, max_rss);
+}
+
 }  // namespace bin
 }  // namespace dart
 
 #endif  // !defined(DART_IO_DISABLED)