Abstract WebContents/NavigationController from core TabRestore code

components/sessions/content/content_open_tab.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 "components/sessions/content/content_open_tab.h"
+
+#include "content/public/browser/web_contents.h"
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(sessions::ContentOpenTab);
+
+namespace sessions {
+
+ContentOpenTab::ContentOpenTab(content::WebContents* contents)
+    : web_contents_(contents) {}
+
+ContentOpenTab::~ContentOpenTab() {}
+
+int ContentOpenTab::GetCurrentEntryIndex() {
+  return navigation_controller().GetCurrentEntryIndex();
+}
+
+int ContentOpenTab::GetPendingEntryIndex() {
+  return navigation_controller().GetPendingEntryIndex();
+}
+
+sessions::SerializedNavigationEntry ContentOpenTab::GetEntryAtIndex(int index) {
+  return sessions::ContentSerializedNavigationBuilder::FromNavigationEntry(
+      index, *navigation_controller().GetEntryAtIndex(index));
+}
+
+sessions::SerializedNavigationEntry ContentOpenTab::GetPendingEntry() {
+  return sessions::ContentSerializedNavigationBuilder::FromNavigationEntry(
+      GetPendingEntryIndex(), *navigation_controller().GetPendingEntry());
+}
+
+int ContentOpenTab::GetEntryCount() {
+  return navigation_controller().GetEntryCount();
+}
+
+void ContentOpenTab::LoadIfNecessary() {
+  navigation_controller().LoadIfNecessary();
+}
+
+const std::string& ContentOpenTab::GetUserAgentOverride() const {
+  return web_contents()->GetUserAgentOverride();
+}
+
+}  // namespace sessions