Abstract WebContents/NavigationController from core TabRestore code

components/sessions/content/content_live_tab.cc

Index: components/sessions/content/content_live_tab.cc
diff --git a/components/sessions/content/content_live_tab.cc b/components/sessions/content/content_live_tab.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f7fdad23b74f32fafbba437f730a6ae6d11e3f63
--- /dev/null
+++ b/components/sessions/content/content_live_tab.cc
@@ -0,0 +1,65 @@
+// 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_live_tab.h"
+
+namespace {
+const char kContentLiveTabWebContentsUserDataKey[] = "content_live_tab";
+}
+
+namespace sessions {
+
+// static
+void ContentLiveTab::CreateForWebContents(content::WebContents* contents) {
+  if (FromWebContents(contents))
+    return;
+
+  contents->SetUserData(
+      kContentLiveTabWebContentsUserDataKey,
+      new ContentLiveTab(contents));
+}
+
+// static
+ContentLiveTab* ContentLiveTab::FromWebContents(
+    content::WebContents* contents) {
+  return static_cast<ContentLiveTab*>(contents->GetUserData(
+      kContentLiveTabWebContentsUserDataKey));
+}
+
+ContentLiveTab::ContentLiveTab(content::WebContents* contents)
+    : web_contents_(contents) {}
+
+ContentLiveTab::~ContentLiveTab() {}
+
+int ContentLiveTab::GetCurrentEntryIndex() {
+  return navigation_controller().GetCurrentEntryIndex();
+}
+
+int ContentLiveTab::GetPendingEntryIndex() {
+  return navigation_controller().GetPendingEntryIndex();
+}
+
+sessions::SerializedNavigationEntry ContentLiveTab::GetEntryAtIndex(int index) {
+  return sessions::ContentSerializedNavigationBuilder::FromNavigationEntry(
+      index, *navigation_controller().GetEntryAtIndex(index));
+}
+
+sessions::SerializedNavigationEntry ContentLiveTab::GetPendingEntry() {
+  return sessions::ContentSerializedNavigationBuilder::FromNavigationEntry(
+      GetPendingEntryIndex(), *navigation_controller().GetPendingEntry());
+}
+
+int ContentLiveTab::GetEntryCount() {
+  return navigation_controller().GetEntryCount();
+}
+
+void ContentLiveTab::LoadIfNecessary() {
+  navigation_controller().LoadIfNecessary();
+}
+
+const std::string& ContentLiveTab::GetUserAgentOverride() const {
+  return web_contents()->GetUserAgentOverride();
+}
+
+}  // namespace sessions