Implement MojoGetBufferInformation(), part 1.

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 <utility>
 
 #include "mojo/edk/system/memory.h"
@@ skipping 73 matching lines @@
       UserPointer<const MojoDuplicateBufferHandleOptions> in_options,
       MojoDuplicateBufferHandleOptions* out_options);
 
   // |Dispatcher| protected methods:
   void CloseImplNoLock() override;
   util::RefPtr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override;
   MojoResult DuplicateBufferHandleImplNoLock(
       UserPointer<const MojoDuplicateBufferHandleOptions> options,
       util::RefPtr<Dispatcher>* new_dispatcher) override;
+  MojoResult GetBufferInformationImplNoLock(
+      UserPointer<MojoBufferInformation> info,
+      uint32_t info_num_bytes) override;
   MojoResult MapBufferImplNoLock(
       uint64_t offset,
       uint64_t num_bytes,
       MojoMapBufferFlags flags,
       std::unique_ptr<platform::PlatformSharedBufferMapping>* mapping) override;
   void StartSerializeImplNoLock(Channel* channel,
                                 size_t* max_size,
                                 size_t* max_platform_handles) override
       MOJO_NOT_THREAD_SAFE;
   bool EndSerializeAndCloseImplNoLock(
       Channel* channel,
       void* destination,
       size_t* actual_size,
       std::vector<platform::ScopedPlatformHandle>* platform_handles) override
       MOJO_NOT_THREAD_SAFE;
 
   util::RefPtr<platform::PlatformSharedBuffer> shared_buffer_
       MOJO_GUARDED_BY(mutex());
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(SharedBufferDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_SHARED_BUFFER_DISPATCHER_H_