Mojo: Add a C++-style SharedBuffer API.

mojo/public/cpp/system/handle.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_PUBLIC_CPP_SYSTEM_HANDLE_H_
 #define MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_
 
 #include <stdint.h>
 #include <limits>
 
@@ skipping 78 matching lines @@
   ScopedHandleBase(ScopedHandleBase&& other) : handle_(other.release()) {}
   ScopedHandleBase& operator=(ScopedHandleBase&& other) {
     if (&other != this) {
       CloseIfNecessary();
       handle_ = other.release();
     }
     return *this;
   }
 
   const HandleType& get() const { return handle_; }
+  const HandleType* operator->() const { return &handle_; }
 
   template <typename PassedHandleType>
   static ScopedHandleBase<HandleType> From(
       ScopedHandleBase<PassedHandleType> other) {
     static_assert(
         sizeof(static_cast<PassedHandleType*>(static_cast<HandleType*>(0))),
         "HandleType is not a subtype of PassedHandleType");
     return ScopedHandleBase<HandleType>(
         static_cast<HandleType>(other.release().value()));
   }
@@ skipping 186 matching lines @@
 }
 
 // Comparison, so that |Handle|s can be used as keys in hash maps.
 inline bool operator==(const Handle a, const Handle b) {
   return a.value() == b.value();
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_