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diff --git a/o3d/statsreport/aggregator-win32.h b/o3d/statsreport/aggregator-win32.h
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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+// Win32 aggregator, which aggregates counters to registry under a named
+// Mutex lock.
+#ifndef O3D_STATSREPORT_AGGREGATOR_WIN32_H__
+#define O3D_STATSREPORT_AGGREGATOR_WIN32_H__
+
+#include "aggregator.h"
+#include <atlbase.h>
+#include <atlstr.h>
+
+namespace stats_report {
+
+class MetricsAggregatorWin32: public MetricsAggregator {
+ public:
+  // @param coll the metrics collection to aggregate, most usually this
+  //           is g_global_metrics.
+  // @param app_name name of the subkey under HKCU\Software\Google we
+  //           aggregate to. Should be or encode the application name for
+  //           transparency, e.g. "Scour", or "Gears".
+  MetricsAggregatorWin32(const MetricCollection &coll,
+                         const wchar_t *app_name);
+
+  // @param is_machine specifies the registry hive where the stats are
+  //           aggregated to.
+  MetricsAggregatorWin32(const MetricCollection &coll,
+                         const wchar_t *app_name,
+                         bool is_machine);
+  virtual ~MetricsAggregatorWin32();
+
+ protected:
+  virtual bool StartAggregation();
+  virtual void EndAggregation();
+
+  virtual void Aggregate(CountMetric *metric);
+  virtual void Aggregate(TimingMetric *metric);
+  virtual void Aggregate(IntegerMetric *metric);
+  virtual void Aggregate(BoolMetric *metric);
+ private:
+  enum {
+    // Max length of time we wait for the mutex on StartAggregation.
+    kMaxMutexWaitMs = 1000,  // 1 second for now
+  };
+
+  // Ensures that *key is open, opening it if it's NULL
+  // @return true on success, false on failure to open key
+  bool EnsureKey(const wchar_t *name, CRegKey *key);
+
+  // Mutex name for locking access to key
+  CString mutex_name_;
+
+  // Subkey name, as per constructor docs
+  CString key_name_;
+
+  // Handle to our subkey under HKCU\Software\Google
+  CRegKey key_;
+
+  // Subkeys under the above
+  // @{
+  CRegKey count_key_;
+  CRegKey timing_key_;
+  CRegKey integer_key_;
+  CRegKey bool_key_;
+  // @}
+
+  // Specifies HKLM or HKCU, respectively.
+  bool is_machine_;
+
+  DISALLOW_COPY_AND_ASSIGN(MetricsAggregatorWin32);
+};
+
+}  // namespace stats_report
+
+#endif  // O3D_STATSREPORT_AGGREGATOR_WIN32_H__