Implements ListenForSessionMessages in PresentationServiceImpl; uses Swap to avoid copying large da…

content/public/browser/presentation_session_message.cc

+// Copyright 2015 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 "content/public/browser/presentation_session_message.h"
+
+namespace content {
+
+PresentationSessionMessage::PresentationSessionMessage(
+    const std::string& presentation_url,
+    const std::string& presentation_id,
+    scoped_ptr<std::string> message)
+    : presentation_url(presentation_url),
+      presentation_id(presentation_id),
+      message(message.Pass()),
+      data(nullptr) {
+}
+
+PresentationSessionMessage::PresentationSessionMessage(
+    const std::string& presentation_url,
+    const std::string& presentation_id,
+    scoped_ptr<std::vector<uint8_t>> data)
+    : presentation_url(presentation_url),
+      presentation_id(presentation_id),
+      message(nullptr),
+      data(data.Pass()) {
+}
+
+bool PresentationSessionMessage::is_binary() const {
+  return data != nullptr && !data->empty();

[mark a. foltz, 2015/05/01 19:42:07]

Empty messages are allowed by the current spec.

[haibinlu, 2015/05/02 00:32:55]

Done.

+}
+
+PresentationSessionMessage::~PresentationSessionMessage() {
+}
+
+}  // namespace content