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diff --git a/chromium/mojo/system/constants.h b/chromium/mojo/system/constants.h
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+++ b/chromium/mojo/system/constants.h
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+// Copyright 2013 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.
+
+#ifndef MOJO_SYSTEM_CONSTANTS_H_
+#define MOJO_SYSTEM_CONSTANTS_H_
+
+#include <stddef.h>
+
+namespace mojo {
+namespace system {
+
+// Maximum number of open (Mojo) handles.
+// TODO(vtl): This doesn't count "live" handles, some of which may live in
+// messages.
+const size_t kMaxHandleTableSize = 1000000;
+
+// Maximum number of active memory mappings.
+const size_t kMaxMappingTableSize = 1000000;
+
+const size_t kMaxWaitManyNumHandles = kMaxHandleTableSize;
+
+const size_t kMaxMessageNumBytes = 4 * 1024 * 1024;
+
+const size_t kMaxMessageNumHandles = 10000;
+
+// Maximum capacity of a data pipe, in bytes. This value must fit into a
+// |uint32_t|.
+// WARNING: If you bump it closer to 2^32, you must audit all the code to check
+// that we don't overflow (2^31 would definitely be risky; up to 2^30 is
+// probably okay).
+const size_t kMaxDataPipeCapacityBytes = 256 * 1024 * 1024;  // 256 MB.
+
+const size_t kDefaultDataPipeCapacityBytes = 1024 * 1024;  // 1 MB.
+
+// Alignment for the "start" of the data buffer used by data pipes. (The
+// alignment of elements will depend on this and the element size.)
+const size_t kDataPipeBufferAlignmentBytes = 16;
+
+// TODO(vtl): Set this hard limit appropriately (e.g., higher on 64-bit). (This
+// will also entail some auditing to make sure I'm not messing up my checks
+// anywhere.)
+const size_t kMaxSharedMemoryNumBytes = 1024 * 1024 * 1024;  // 1 GB.
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_CONSTANTS_H_