[PresentationAPI] Implementing send() from WebPresentationClient to the PresentationService.

content/public/browser/presentation_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_message.h"
+
+namespace content {
+
+PresentationMessageRequest::PresentationMessageRequest(
+    const std::string& presentation_url,
+    const std::string& presentation_id,
+    PresentationMessageType type,
+    const std::string& message,
+    const std::vector<uint8_t>& data)
+    : presentation_url(presentation_url),
+      presentation_id(presentation_id),
+      type(type),
+      message(message),
+      data(data) {
+}
+
+PresentationMessageRequest::~PresentationMessageRequest() {
+}
+
+}  // namespace content
+