Introduce TabRestoreServiceClient and //chrome implementation.

chrome/browser/sessions/tab_restore_service_factory.cc

Index: chrome/browser/sessions/tab_restore_service_factory.cc
diff --git a/chrome/browser/sessions/tab_restore_service_factory.cc b/chrome/browser/sessions/tab_restore_service_factory.cc
index 3c457ed9809b9c4500abec38f5dee5fa0a4336bc..a0d5db400d9353f16cf4023697bbf0c1584fda28 100644
--- a/chrome/browser/sessions/tab_restore_service_factory.cc
+++ b/chrome/browser/sessions/tab_restore_service_factory.cc
@@ -5,9 +5,15 @@
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
 
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/sessions/tab_restore_service.h"
+#include "chrome/browser/sessions/chrome_tab_restore_service_client.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
+#if defined(OS_ANDROID)
+#include "chrome/browser/sessions/in_memory_tab_restore_service.h"
+#else
+#include "chrome/browser/sessions/persistent_tab_restore_service.h"
+#endif
+
 // static
 TabRestoreService* TabRestoreServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<TabRestoreService*>(
@@ -44,3 +50,16 @@ TabRestoreServiceFactory::~TabRestoreServiceFactory() {
 bool TabRestoreServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }
+
+KeyedService* TabRestoreServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* browser_context) const {
+  Profile* profile = Profile::FromBrowserContext(browser_context);
+  scoped_ptr<sessions::TabRestoreServiceClient> client(
+      new ChromeTabRestoreServiceClient(profile));
+
+#if defined(OS_ANDROID)
+  return new InMemoryTabRestoreService(profile, nullptr);
+#else
+  return new PersistentTabRestoreService(profile, client.Pass(), nullptr);
+#endif
+}