[mojo-edk] Add MojoWatch and MojoCancelWatch APIs

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 49 matching lines @@
       size_t num_ports,
       PlatformHandle* platform_handles,
       size_t num_platform_handles);
 
   // Passes the underlying platform shared buffer. This dispatcher must be
   // closed after calling this function.
   scoped_refptr<PlatformSharedBuffer> PassPlatformSharedBuffer();
 
   // Dispatcher:
   Type GetType() const override;
-  MojoResult Close() override;
+  MojoResult Close(RequestContext* request_context) override;
   MojoResult DuplicateBufferHandle(
       const MojoDuplicateBufferHandleOptions* options,
       scoped_refptr<Dispatcher>* new_dispatcher) override;
   MojoResult MapBuffer(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
       scoped_ptr<PlatformSharedBufferMapping>* mapping) override;
   void StartSerialize(uint32_t* num_bytes,
                       uint32_t* num_ports,
                       uint32_t* num_platform_handles) override;
   bool EndSerialize(void* destination,
                     ports::PortName* ports,
                     PlatformHandle* handles) override;
-  bool BeginTransit() override;
-  void CompleteTransitAndClose() override;
-  void CancelTransit() override;
+  bool BeginTransit(RequestContext* request_context) override;
+  void CompleteTransitAndClose(RequestContext* request_context) override;
+  void CancelTransit(RequestContext* request_context) override;
 
  private:
   static scoped_refptr<SharedBufferDispatcher> CreateInternal(
       scoped_refptr<PlatformSharedBuffer> shared_buffer) {
     return make_scoped_refptr(
         new SharedBufferDispatcher(std::move(shared_buffer)));
   }
 
   explicit SharedBufferDispatcher(
       scoped_refptr<PlatformSharedBuffer> shared_buffer);
@@ skipping 19 matching lines @@
 
   scoped_refptr<PlatformSharedBuffer> shared_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_