Create ash memory monitor

ash/system/monitor/tray_monitor.cc

Index: ash/system/monitor/tray_monitor.cc
diff --git a/ash/system/monitor/tray_monitor.cc b/ash/system/monitor/tray_monitor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4e4336d61591dcc825ad61080d6bd3ce44aa7fac
--- /dev/null
+++ b/ash/system/monitor/tray_monitor.cc
@@ -0,0 +1,62 @@
+// Copyright (c) 2012 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 "ash/system/monitor/tray_monitor.h"
+
+#include "ash/system/tray/tray_item_view.h"
+#include "ash/system/tray/tray_views.h"
+#include "base/process_util.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "ui/base/text/bytes_formatting.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/border.h"
+
+namespace {
+const int kRefreshTimeoutMs = 1000;
+}
+
+namespace ash {
+namespace internal {
+
+TrayMonitor::TrayMonitor() : label_(NULL) {
+  refresh_timer_.Start(FROM_HERE,
+      base::TimeDelta::FromMilliseconds(kRefreshTimeoutMs),
+      this, &TrayMonitor::RefreshStats);
+}
+
+TrayMonitor::~TrayMonitor() {
+  label_ = NULL;
+}
+
+views::View* TrayMonitor::CreateTrayView(user::LoginStatus status) {
+  TrayItemView* view = new TrayItemView;
+  view->CreateLabel();
+  label_ = view->label();
+  SetupLabelForTray(label_);
+  return view;
+}
+
+void TrayMonitor::DestroyTrayView() {
+  label_ = NULL;
+}
+
+void TrayMonitor::RefreshStats() {
+  base::SystemMemoryInfoKB mem_info;
+  base::GetSystemMemoryInfo(&mem_info);
+  std::string output;
+  string16 free_bytes =
+      ui::FormatBytes(static_cast<int64>(mem_info.free) * 1024);
+  output = StringPrintf("%s free", UTF16ToUTF8(free_bytes).c_str());
+  if (mem_info.gem_objects != -1 && mem_info.gem_size != -1) {
+    string16 gem_size = ui::FormatBytes(mem_info.gem_size);
+    output += StringPrintf(", %d gobjects alloced (%s)",
+                           mem_info.gem_objects,
+                           UTF16ToUTF8(gem_size).c_str());
+  }
+  label_->SetText(UTF8ToUTF16(output));
+}
+
+}  // namespace internal
+}  // namespace ash