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

mojo/edk/system/shared_buffer_dispatcher.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_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_
 
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/memory.h"
 #include "mojo/edk/system/simple_dispatcher.h"
@@ skipping 37 matching lines @@
       const MojoCreateSharedBufferOptions& validated_options,
       uint64_t num_bytes,
       scoped_refptr<SharedBufferDispatcher>* result);
 
   // |Dispatcher| public methods:
   Type GetType() const override;
 
   // The "opposite" of |SerializeAndClose()|. (Typically this is called by
   // |Dispatcher::Deserialize()|.)
   static scoped_refptr<SharedBufferDispatcher> Deserialize(
-      Channel* channel,
       const void* source,
       size_t size,
       embedder::PlatformHandleVector* platform_handles);
 
  private:
   static scoped_refptr<SharedBufferDispatcher> CreateInternal(
       scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer) {
     return make_scoped_refptr(new SharedBufferDispatcher(shared_buffer.Pass()));
   }
 
@@ skipping 15 matching lines @@
   scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override;
   MojoResult DuplicateBufferHandleImplNoLock(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       scoped_refptr<Dispatcher>* new_dispatcher) override;
   MojoResult MapBufferImplNoLock(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
       scoped_ptr<embedder::PlatformSharedBufferMapping>* mapping) override;
-  void StartSerializeImplNoLock(Channel* channel,
-                                size_t* max_size,
-                                size_t* max_platform_handles) override
-      MOJO_NOT_THREAD_SAFE;
+  void StartSerializeImplNoLock(size_t* max_size,
+                                size_t* max_platform_handles) override;
   bool EndSerializeAndCloseImplNoLock(
-      Channel* channel,
       void* destination,
       size_t* actual_size,
-      embedder::PlatformHandleVector* platform_handles) override
-      MOJO_NOT_THREAD_SAFE;
+      embedder::PlatformHandleVector* platform_handles) override;
 
-  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_
-      MOJO_GUARDED_BY(mutex());
+  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_