[Memory] Add system_memory_stats_recorder_win.cc

chrome/browser/memory/system_memory_stats_recorder_win.cc

Index: chrome/browser/memory/system_memory_stats_recorder_win.cc
diff --git a/chrome/browser/memory/system_memory_stats_recorder_win.cc b/chrome/browser/memory/system_memory_stats_recorder_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b90949869883e60f0579298ed4f865978aa95a07
--- /dev/null
+++ b/chrome/browser/memory/system_memory_stats_recorder_win.cc
@@ -0,0 +1,44 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/memory/system_memory_stats_recorder.h"
+
+#include <windows.h>
+
+#include "base/metrics/histogram_macros.h"
+#include "base/process/process_metrics.h"
+
+namespace memory {
+
+void RecordMemoryStats(RecordMemoryStatsType type) {
+  MEMORYSTATUSEX mem_status;
+  mem_status.dwLength = sizeof(mem_status);
+  if (!::GlobalMemoryStatusEx(&mem_status))
+    return;
+
+  switch (type) {
+    case RECORD_MEMORY_STATS_TAB_DISCARDED: {
+      UMA_HISTOGRAM_CUSTOM_COUNTS("Memory.Stats.Win.MemoryLoad",
+                                  mem_status.dwMemoryLoad, 0, 100, 101);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPhys",
+                                    mem_status.ullTotalPhys);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPhys",
+                                    mem_status.ullAvailPhys);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPageFile",
+                                    mem_status.ullTotalPageFile);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPageFile",
+                                    mem_status.ullAvailPageFile);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalVirtual",
+                                    mem_status.ullTotalVirtual);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailVirtual",
+                                    mem_status.ullAvailVirtual);
+      break;
+    }
+    default:
+      NOTREACHED() << L"Received unexpected notification";
+      break;
+  }
+}
+
+}  // namespace memory