[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

base/memory/shared_memory_nacl.cc

 // 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 "base/memory/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
 #include <limits>
 
 #include "base/logging.h"
+#include "base/strings/stringprintf.h"
 
 namespace base {
 
 SharedMemory::SharedMemory()
     : mapped_size_(0), memory_(NULL), read_only_(false), requested_size_(0) {}
 
 SharedMemory::SharedMemory(const SharedMemoryHandle& handle, bool read_only)
     : shm_(handle),
       mapped_size_(0),
       memory_(NULL),
@@ skipping 98 matching lines @@
   }
 }
 
 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() {
   // Untrusted code can't create descriptors or handles, which is needed to
   // drop permissions.
   return SharedMemoryHandle();
 }
 
 }  // namespace base