Mojo: Implement MojoUnmapBuffer().

mojo/system/core_impl.h

 // Copyright 2013 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_SYSTEM_CORE_IMPL_H_
 #define MOJO_SYSTEM_CORE_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "mojo/public/system/core_private.h"
 #include "mojo/system/handle_table.h"
+#include "mojo/system/mapping_table.h"
 #include "mojo/system/system_impl_export.h"
 
 namespace mojo {
 namespace system {
 
 class Dispatcher;
 
 // |CoreImpl| is a singleton object that implements the Mojo system calls. All
 // public methods are thread-safe.
 class MOJO_SYSTEM_IMPL_EXPORT CoreImpl : public Core {
@@ skipping 107 matching lines @@
                               uint32_t num_handles,
                               MojoDeadline deadline);
 
   // ---------------------------------------------------------------------------
 
   // TODO(vtl): |handle_table_lock_| should be a reader-writer lock (if only we
   // had them).
   base::Lock handle_table_lock_;  // Protects |handle_table_|.
   HandleTable handle_table_;
 
+  base::Lock mapping_table_lock_;  // Protects |mapping_table_|.
+  MappingTable mapping_table_;
+
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(CoreImpl);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_CORE_IMPL_H_