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

mojo/edk/system/shared_buffer_dispatcher.h

Index: mojo/edk/system/shared_buffer_dispatcher.h
diff --git a/third_party/mojo/src/mojo/edk/system/shared_buffer_dispatcher.h b/mojo/edk/system/shared_buffer_dispatcher.h
similarity index 83%
copy from third_party/mojo/src/mojo/edk/system/shared_buffer_dispatcher.h
copy to mojo/edk/system/shared_buffer_dispatcher.h
index 1222e030c185364ce3347b229a2bdcaa9c230141..31570d6145bb9660a33ec0ac875993b62a0b7c52 100644
--- a/third_party/mojo/src/mojo/edk/system/shared_buffer_dispatcher.h
+++ b/mojo/edk/system/shared_buffer_dispatcher.h
@@ -13,11 +13,8 @@
 
 namespace mojo {
 
-namespace embedder {
+namespace edk {
 class PlatformSupport;
-}
-
-namespace system {
 
 // TODO(vtl): We derive from SimpleDispatcher, even though we don't currently
 // have anything that's waitable. I want to add a "transferrable" wait flag
@@ -44,7 +41,7 @@ class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher final
   // TODO(vtl): This should probably be made to return a scoped_refptr and have
   // a MojoResult out parameter instead.
   static MojoResult Create(
-      embedder::PlatformSupport* platform_support,
+      PlatformSupport* platform_support,
       const MojoCreateSharedBufferOptions& validated_options,
       uint64_t num_bytes,
       scoped_refptr<SharedBufferDispatcher>* result);
@@ -55,19 +52,18 @@ class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher final
   // 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);
+      PlatformHandleVector* platform_handles);
 
  private:
   static scoped_refptr<SharedBufferDispatcher> CreateInternal(
-      scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer) {
+      scoped_refptr<PlatformSharedBuffer> shared_buffer) {
     return make_scoped_refptr(new SharedBufferDispatcher(shared_buffer.Pass()));
   }
 
   explicit SharedBufferDispatcher(
-      scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer);
+      scoped_refptr<PlatformSharedBuffer> shared_buffer);
   ~SharedBufferDispatcher() override;
 
   // Validates and/or sets default options for
@@ -90,25 +86,20 @@ class MOJO_SYSTEM_IMPL_EXPORT SharedBufferDispatcher final
       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;
+      scoped_ptr<PlatformSharedBufferMapping>* mapping) override;
+  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;
+      PlatformHandleVector* platform_handles) override;
 
-  scoped_refptr<embedder::PlatformSharedBuffer> shared_buffer_
-      MOJO_GUARDED_BY(mutex());
+  scoped_refptr<PlatformSharedBuffer> shared_buffer_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_