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

mojo/edk/system/platform_handle_dispatcher.h

Index: mojo/edk/system/platform_handle_dispatcher.h
diff --git a/third_party/mojo/src/mojo/edk/system/platform_handle_dispatcher.h b/mojo/edk/system/platform_handle_dispatcher.h
similarity index 73%
copy from third_party/mojo/src/mojo/edk/system/platform_handle_dispatcher.h
copy to mojo/edk/system/platform_handle_dispatcher.h
index 8e8cf6904d96450fb8f6223cabcc78996155d9fe..99ffcac7b06acb61faf3d75a39e9f8cfb128ad36 100644
--- a/third_party/mojo/src/mojo/edk/system/platform_handle_dispatcher.h
+++ b/mojo/edk/system/platform_handle_dispatcher.h
@@ -11,7 +11,7 @@
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace system {
+namespace edk {
 
 // A dispatcher that simply wraps/transports a |PlatformHandle| (only for use by
 // the embedder).
@@ -19,12 +19,12 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformHandleDispatcher final
     : public SimpleDispatcher {
  public:
   static scoped_refptr<PlatformHandleDispatcher> Create(
-      embedder::ScopedPlatformHandle platform_handle) {
+      ScopedPlatformHandle platform_handle) {
     return make_scoped_refptr(
         new PlatformHandleDispatcher(platform_handle.Pass()));
   }
 
-  embedder::ScopedPlatformHandle PassPlatformHandle();
+  ScopedPlatformHandle PassPlatformHandle();
 
   // |Dispatcher| public methods:
   Type GetType() const override;
@@ -32,37 +32,32 @@ class MOJO_SYSTEM_IMPL_EXPORT PlatformHandleDispatcher final
   // The "opposite" of |SerializeAndClose()|. (Typically this is called by
   // |Dispatcher::Deserialize()|.)
   static scoped_refptr<PlatformHandleDispatcher> Deserialize(
-      Channel* channel,
       const void* source,
       size_t size,
-      embedder::PlatformHandleVector* platform_handles);
+      PlatformHandleVector* platform_handles);
 
  private:
   explicit PlatformHandleDispatcher(
-      embedder::ScopedPlatformHandle platform_handle);
+      ScopedPlatformHandle platform_handle);
   ~PlatformHandleDispatcher() override;
 
   // |Dispatcher| protected methods:
   void CloseImplNoLock() override;
   scoped_refptr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       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;
+      PlatformHandleVector* platform_handles) override;
 
-  embedder::ScopedPlatformHandle platform_handle_ MOJO_GUARDED_BY(mutex());
+  ScopedPlatformHandle platform_handle_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(PlatformHandleDispatcher);
 };
 
-}  // namespace system
+}  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_PLATFORM_HANDLE_DISPATCHER_H_