Implements JS bindings for mojo shared buffer.

third_party/WebKit/Source/core/mojo/Mojo.cpp

 // Copyright 2017 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 "core/mojo/Mojo.h"
 
 #include "core/mojo/MojoCreateMessagePipeResult.h"
+#include "core/mojo/MojoCreateSharedBufferResult.h"
 #include "core/mojo/MojoHandle.h"
 
 namespace blink {
 
 // static
 void Mojo::createMessagePipe(MojoCreateMessagePipeResult& resultDict) {
   MojoCreateMessagePipeOptions options = {0};
   options.struct_size = sizeof(::MojoCreateMessagePipeOptions);
   options.flags = MOJO_CREATE_MESSAGE_PIPE_OPTIONS_FLAG_NONE;
 
   mojo::ScopedMessagePipeHandle handle0, handle1;
   MojoResult result = mojo::CreateMessagePipe(&options, &handle0, &handle1);
 
   resultDict.setResult(result);
   if (result == MOJO_RESULT_OK) {
     resultDict.setHandle0(
         MojoHandle::create(mojo::ScopedHandle::From(std::move(handle0))));
     resultDict.setHandle1(
         MojoHandle::create(mojo::ScopedHandle::From(std::move(handle1))));
   }
 }
 
+// static
+void Mojo::createSharedBuffer(unsigned numBytes,
+                              MojoCreateSharedBufferResult& resultDict) {
+  MojoCreateSharedBufferOptions* options = nullptr;
+  mojo::Handle handle;
+  MojoResult result =
+      MojoCreateSharedBuffer(options, numBytes, handle.mutable_value());
+
+  resultDict.setResult(result);
+  if (result == MOJO_RESULT_OK) {
+    resultDict.setHandle(MojoHandle::create(mojo::MakeScopedHandle(handle)));
+  }
+}
+
 }  // namespace blink