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

mojo/edk/system/dispatcher_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.
 
 #include "mojo/edk/system/dispatcher.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/simple_thread.h"
@@ skipping 13 matching lines @@
   TrivialDispatcher() {}
 
   Type GetType() const override { return Type::UNKNOWN; }
 
  private:
   friend class base::RefCountedThreadSafe<TrivialDispatcher>;
   ~TrivialDispatcher() override {}
 
   scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override {
-    mutex().AssertHeld();
+    lock().AssertAcquired();
     return scoped_refptr<Dispatcher>(new TrivialDispatcher());
   }
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(TrivialDispatcher);
 };
 
 TEST(DispatcherTest, Basic) {
   scoped_refptr<Dispatcher> d(new TrivialDispatcher());
 
   EXPECT_EQ(Dispatcher::Type::UNKNOWN, d->GetType());
@@ skipping 253 matching lines @@
       event.Signal();
     }  // Joins all the threads.
 
     EXPECT_EQ(MOJO_RESULT_OK, d->Close());
   }
 }
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo