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

mojo/edk/system/options_validation_unittest.cc

 // 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.
 
 #include "mojo/edk/system/options_validation.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "mojo/public/c/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 namespace {
 
 // Declare a test options struct just as we do in actual public headers.
 
 using TestOptionsFlags = uint32_t;
 
 static_assert(MOJO_ALIGNOF(int64_t) == 8, "int64_t has weird alignment");
 struct MOJO_ALIGNAS(8) TestOptions {
   uint32_t struct_size;
   TestOptionsFlags flags;
@@ skipping 94 matching lines @@
         TestOptions* options = (reinterpret_cast<uintptr_t>(buffer) % 8 == 0)
                                    ? reinterpret_cast<TestOptions*>(&buffer[1])
                                    : reinterpret_cast<TestOptions*>(&buffer[0]);
         options->struct_size = static_cast<uint32_t>(sizeof(TestOptions));
         UserOptionsReader<TestOptions> reader(MakeUserPointer(options));
       },
       kMemoryCheckFailedRegex);
 }
 
 }  // namespace
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo