Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

mojo/edk/embedder/platform_channel_utils_posix.h

 // 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_PLATFORM_CHANNEL_UTILS_POSIX_H_
 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_
 
 #include <stddef.h>
 #include <sys/types.h>  // For |ssize_t|.
 
 #include <deque>
 
 #include "base/memory/scoped_ptr.h"
 #include "mojo/edk/embedder/platform_handle.h"
 #include "mojo/edk/system/system_impl_export.h"
 
 struct iovec;  // Declared in <sys/uio.h>.
 
 namespace mojo {
-namespace embedder {
+namespace edk {
 
 // The maximum number of handles that can be sent "at once" using
 // |PlatformChannelSendmsgWithHandles()|.
 // TODO(vtl): This number is taken from ipc/ipc_message_attachment_set.h:
 // |IPC::MessageAttachmentSet::kMaxDescriptorsPerMessage|.
 const size_t kPlatformChannelMaxNumHandles = 128;
 
 // Use these to write to a socket created using |PlatformChannelPair| (or
 // equivalent). These are like |write()| and |writev()|, but handle |EINTR| and
 // never raise |SIGPIPE|. (Note: On Mac, the suppression of |SIGPIPE| is set up
@@ skipping 32 matching lines @@
 
 // Wrapper around |recvmsg()|, which will extract any attached file descriptors
 // (in the control message) to |PlatformHandle|s (and append them to
 // |platform_handles|). (This also handles |EINTR|.)
 MOJO_SYSTEM_IMPL_EXPORT ssize_t
 PlatformChannelRecvmsg(PlatformHandle h,
                        void* buf,
                        size_t num_bytes,
                        std::deque<PlatformHandle>* platform_handles);
 
-}  // namespace embedder
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_