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

runtime/bin/process_win.cc

Index: runtime/bin/process_win.cc
diff --git a/runtime/bin/process_win.cc b/runtime/bin/process_win.cc
index 56cd57d6b164b57539d914f76217e742a804f343..95f9cd34ad13f4c1bbc959568c9d9347ebed7d70 100644
--- a/runtime/bin/process_win.cc
+++ b/runtime/bin/process_win.cc
@@ -9,6 +9,7 @@
 
 #include "bin/process.h"
 
+#include <psapi.h>    // NOLINT
 #include <process.h>  // NOLINT
 
 #include "bin/builtin.h"
@@ -941,6 +942,24 @@ intptr_t Process::CurrentProcessId() {
 }
 
 
+int64_t Process::CurrentRSS() {
+  PROCESS_MEMORY_COUNTERS pmc;
+  if (!GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc))) {
+    return -1;
+  }
+  return pmc.WorkingSetSize;
+}
+
+
+int64_t Process::MaxRSS() {
+  PROCESS_MEMORY_COUNTERS pmc;
+  if (!GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc))) {
+    return -1;
+  }
+  return pmc.PeakWorkingSetSize;
+}
+
+
 static SignalInfo* signal_handlers = NULL;
 static Mutex* signal_mutex = new Mutex();