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

mojo/edk/system/awakable_list_unittest.cc

 // 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.
 
 // NOTE(vtl): Some of these tests are inherently flaky (e.g., if run on a
 // heavily-loaded system). Sorry. |test::EpsilonDeadline()| may be increased to
 // increase tolerance and reduce observed flakiness (though doing so reduces the
 // meaningfulness of the test).
 
 #include "mojo/edk/system/awakable_list.h"
@@ skipping 336 matching lines @@
   EXPECT_EQ(keep1.awake_count, 2);
   EXPECT_EQ(remove2.awake_count, 1);
 
   remove_first.Remove(&keep0);
   remove_first.Remove(&keep1);
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo