[Presentation API] Additional plumbing for PresentationServiceImpl.

content/public/browser/presentation_session.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.h"
+
+namespace content {
+
+PresentationSessionInfo::PresentationSessionInfo(
+    const std::string& presentation_url,
+    const std::string& presentation_id)
+    : presentation_url(presentation_url),
+      presentation_id(presentation_id) {
+}
+
+PresentationSessionInfo::~PresentationSessionInfo() {
+}
+
+PresentationError::PresentationError(
+    PresentationErrorType error_type,
+    const std::string& message)
+    : error_type(error_type),
+      message(message) {
+}
+
+PresentationError::~PresentationError() {
+}
+
+}  // namespace content
+