EDK: Add handle rights checking to the various entrypoints.

mojo/edk/system/shared_buffer_dispatcher.cc

 // 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.
 
 #include "mojo/edk/system/shared_buffer_dispatcher.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 84 matching lines @@
   *result = MOJO_RESULT_OK;
   return CreateInternal(std::move(shared_buffer));
 }
 
 Dispatcher::Type SharedBufferDispatcher::GetType() const {
   return Type::SHARED_BUFFER;
 }
 
 bool SharedBufferDispatcher::SupportsEntrypointClass(
     EntrypointClass entrypoint_class) const {
-  return (entrypoint_class == EntrypointClass::BUFFER);
+  return (entrypoint_class == EntrypointClass::NONE ||
+          entrypoint_class == EntrypointClass::BUFFER);
 }
 
 // static
 RefPtr<SharedBufferDispatcher> SharedBufferDispatcher::Deserialize(
     Channel* channel,
     const void* source,
     size_t size,
     std::vector<ScopedPlatformHandle>* platform_handles) {
   DCHECK(channel);
 
@@ skipping 213 matching lines @@
   platform_handles->push_back(std::move(platform_handle));
   *actual_size = sizeof(SerializedSharedBufferDispatcher);
 
   shared_buffer_ = nullptr;
 
   return true;
 }
 
 }  // namespace system
 }  // namespace mojo