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::blink::CopylessPasteRequest request) {
+  DCHECK(frame);
+
+  mojo::MakeStrongBinding(WTF::makeUnique<CopylessPasteServer>(*frame),

[dcheng, 2017/04/06 05:51:15]

To be honest, I'm not convinced that we should be using MakeStrongBinding in
Blink. It seems like we should have a Blink equivalent for automatically
creating frame-lifetime-associated services. Then we don't need code like line
25-28.

Is this something you would be willing to investigate in a followup?

+                          std::move(request));
+}
+
+void CopylessPasteServer::GetEntities(const GetEntitiesCallback& callback) {
+  if (!m_frame || !m_frame->document()) {
+    callback.Run(nullptr);
+    return;
+  }
+  mojom::blink::WebPagePtr webpage = mojom::blink::WebPage::New();
+  // TODO(wychen): connect with CopylessPasteExtractor::extract() like:
+  // CopylessPasteExtractor::extract(*m_frame->document(), *webpage);
+  callback.Run(std::move(webpage));
+}
+
+}  // namespace blink