Add mojo service for CopylessPaste in Blink

third_party/WebKit/Source/modules/document_metadata/CopylessPasteServer.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 "modules/document_metadata/CopylessPasteServer.h"
+
+#include "core/frame/LocalFrame.h"
+#include "modules/document_metadata/CopylessPasteExtractor.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace blink {
+
+CopylessPasteServer::CopylessPasteServer(LocalFrame& frame) : m_frame(frame) {}
+
+void CopylessPasteServer::bindMojoRequest(
+    LocalFrame* frame,
+    mojom::document_metadata::blink::CopylessPasteRequest request) {
+  DCHECK(frame);
+
+  // TODO(wychen): remove bindMojoRequest pattern, and make this a service
+  // associated with frame lifetime.
+  mojo::MakeStrongBinding(WTF::makeUnique<CopylessPasteServer>(*frame),
+                          std::move(request));
+}
+
+void CopylessPasteServer::GetEntities(const GetEntitiesCallback& callback) {
+  if (!m_frame || !m_frame->document()) {
+    callback.Run(nullptr);
+    return;
+  }
+  // TODO(wychen): connect with CopylessPasteExtractor::extract() like:
+  // callback.Run(CopylessPasteExtractor::extract(*m_frame->document()));
+  callback.Run(nullptr);
+}
+
+}  // namespace blink