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diff --git a/mojo/edk/embedder/configuration.h b/mojo/edk/embedder/configuration.h
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+// Copyright 2014 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_EDK_EMBEDDER_CONFIGURATION_H_
+#define MOJO_EDK_EMBEDDER_CONFIGURATION_H_
+
+#include <stddef.h>
+
+namespace mojo {
+namespace embedder {
+
+// A set of constants that the Mojo system internally uses. These values should
+// be consistent across all processes on the same system.
+//
+// In general, there should be no need to change these values from their
+// defaults. However, if you do change them, you must do so before
+// initialization.
+struct Configuration {
+  // Maximum number of open (Mojo) handles. The default is 1,000,000.
+  //
+  // TODO(vtl): This doesn't count "live" handles, some of which may live in
+  // messages.
+  size_t max_handle_table_size;
+
+  // Maximum number of active memory mappings. The default is 1,000,000.
+  size_t max_mapping_table_sze;
+
+  // Upper limit of |MojoWaitMany()|'s |num_handles|. The default is 1,000,000.
+  // Must be same as or smaller than |max_handle_table_size|.
+  size_t max_wait_many_num_handles;
+
+  // Maximum data size of messages sent over message pipes, in bytes. The
+  // default is 4MB.
+  size_t max_message_num_bytes;
+
+  // Maximum number of handles that can be attached to messages sent over
+  // message pipes. The default is 10,000.
+  size_t max_message_num_handles;
+
+  // Maximum capacity of a data pipe, in bytes. The default is 256MB. 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).
+  size_t max_data_pipe_capacity_bytes;
+
+  // Default data pipe capacity, if not specified explicitly in the creation
+  // options. The default is 1MB.
+  size_t default_data_pipe_capacity_bytes;
+
+  // Alignment for the "start" of the data buffer used by data pipes. (The
+  // alignment of elements will depend on this and the element size.)  The
+  // default is 16 bytes.
+  size_t data_pipe_buffer_alignment_bytes;
+
+  // Maximum size of a single shared memory segment, in bytes. The default is
+  // 1GB.
+  //
+  // 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.)
+  size_t max_shared_memory_num_bytes;
+};
+
+}  // namespace embedder
+}  // namespace mojo
+
+#endif  // MOJO_EDK_EMBEDDER_CONFIGURATION_H_