Shortcut ctrl+shift+T added on android.

chrome/browser/sessions/chrome_tab_restore_service_client.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 "chrome/browser/sessions/chrome_tab_restore_service_client.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_service.h"
 #include "chrome/browser/sessions/session_service_factory.h"
 #include "chrome/common/url_constants.h"
 #include "components/sessions/content/content_live_tab.h"
 #include "content/public/browser/browser_thread.h"
 
 #if defined(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_metrics.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #endif
 
 #if !defined(OS_ANDROID)
 #include "chrome/browser/ui/browser_live_tab_context.h"
+#else
+#include "chrome/browser/ui/android/tab_model/android_live_tab_context.h"
 #endif
 
 namespace {
 
 void RecordAppLaunch(Profile* profile, const GURL& url) {
 #if defined(ENABLE_EXTENSIONS)
   const extensions::Extension* extension =
       extensions::ExtensionRegistry::Get(profile)
           ->enabled_extensions()
           .GetAppByURL(url);
   if (!extension)
     return;
 
   extensions::RecordAppLaunchType(
       extension_misc::APP_LAUNCH_NTP_RECENTLY_CLOSED, extension->GetType());
 #endif  // defined(ENABLE_EXTENSIONS)
 }
 
 }  // namespace
 
 ChromeTabRestoreServiceClient::ChromeTabRestoreServiceClient(Profile* profile)
     : profile_(profile) {}
 
 ChromeTabRestoreServiceClient::~ChromeTabRestoreServiceClient() {}
 
 sessions::LiveTabContext* ChromeTabRestoreServiceClient::CreateLiveTabContext(
     const std::string& app_name) {
 #if defined(OS_ANDROID)
-  // Android does not support LiveTabContext, as tab persistence
-  // is implemented on the Java side.
+  // Android does not initialize LiveTabContext here, and tab persistence is
+  // implemented in java.
+  NOTREACHED();
   return nullptr;

[Theresa, 2016/07/02 01:00:37]

This needs to be implemented to use TabRestoreService::RestoreMostRecentEntry:

return AndroidLiveTabContext::FindContextWithID(desired_id);

 #else
   return BrowserLiveTabContext::Create(profile_, app_name);
 #endif
 }
 
 sessions::LiveTabContext*
 ChromeTabRestoreServiceClient::FindLiveTabContextForTab(
     const sessions::LiveTab* tab) {
 #if defined(OS_ANDROID)
-  // Android does not support LiveTabContext, as tab persistence
-  // is implemented on the Java side.
-  return nullptr;
+  return AndroidLiveTabContext::FindContextForWebContents(
+      static_cast<const sessions::ContentLiveTab*>(tab)->web_contents());
 #else
   return BrowserLiveTabContext::FindContextForWebContents(
       static_cast<const sessions::ContentLiveTab*>(tab)->web_contents());
 #endif
 }
 
 sessions::LiveTabContext*
 ChromeTabRestoreServiceClient::FindLiveTabContextWithID(
     SessionID::id_type desired_id) {
 #if defined(OS_ANDROID)
@@ skipping 65 matching lines @@
   DCHECK(HasLastSession());
 #if defined(ENABLE_SESSION_SERVICE)
   SessionServiceFactory::GetForProfile(profile_)
       ->GetLastSession(callback, tracker);
 #endif
 }
 
 void ChromeTabRestoreServiceClient::OnTabRestored(const GURL& url) {
   RecordAppLaunch(profile_, url);
 }