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diff --git a/base/memory/memory_debug.h b/base/memory/memory_debug.h
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+++ b/base/memory/memory_debug.h
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+// Copyright (c) 2011 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.
+
+// Functions used to debug memory usage, leaks, and other memory issues.
+// All methods are effectively no-ops unless this program is being run through
+// a supported memory tool (currently, only Purify)
+
+#ifndef BASE_MEMORY_MEMORY_DEBUG_H_
+#define BASE_MEMORY_MEMORY_DEBUG_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+namespace base {
+
+class MemoryDebug {
+ public:
+  // Since MIU messages are a lot of data, and we don't always want this data,
+  // we have a global switch.  If disabled, *MemoryInUse are no-ops.
+  static void SetMemoryInUseEnabled(bool enabled);
+
+  // Dump information about all memory in use.
+  static void DumpAllMemoryInUse();
+  // Dump information about new memory in use since the last
+  // call to DumpAllMemoryInUse() or DumpNewMemoryInUse().
+  static void DumpNewMemoryInUse();
+
+  // Dump information about all current memory leaks.
+  static void DumpAllLeaks();
+  // Dump information about new memory leaks since the last
+  // call to DumpAllLeaks() or DumpNewLeaks()
+  static void DumpNewLeaks();
+
+  // Mark |size| bytes of memory as initialized, so it doesn't produce any UMRs
+  // or UMCs.
+  static void MarkAsInitialized(void* addr, size_t size);
+
+ private:
+  static bool memory_in_use_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(MemoryDebug);
+};
+
+}  // namespace base
+
+#endif  // BASE_MEMORY_MEMORY_DEBUG_H_