Export a private webstore API to call into the new inline sign-in flow.

chrome/browser/extensions/api/identity/account_tracker.cc

Index: chrome/browser/extensions/api/identity/account_tracker.cc
diff --git a/chrome/browser/extensions/api/identity/account_tracker.cc b/chrome/browser/extensions/api/identity/account_tracker.cc
index daea002bc0100679d0aec0c327a7547f37d948cf..425c0799e60edb71207bf36362288fff9e426cfd 100644
--- a/chrome/browser/extensions/api/identity/account_tracker.cc
+++ b/chrome/browser/extensions/api/identity/account_tracker.cc
@@ -11,7 +11,6 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager.h"
-#include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "content/public/browser/notification_details.h"
 #include "extensions/browser/extension_system.h"
@@ -24,9 +23,12 @@ AccountTracker::AccountTracker(Profile* profile) : profile_(profile) {
   service->AddObserver(this);
   service->signin_error_controller()->AddProvider(this);
   SigninManagerFactory::GetForProfile(profile_)->AddObserver(this);
+  SigninManagerFactory::GetInstance()->AddObserver(this);
 }
 
-AccountTracker::~AccountTracker() {}
+AccountTracker::~AccountTracker() {
+  SigninManagerFactory::GetInstance()->RemoveObserver(this);
+}
 
 void AccountTracker::ReportAuthError(const std::string& account_id,
                                      const GoogleServiceAuthError& error) {
@@ -89,6 +91,14 @@ void AccountTracker::GoogleSignedOut(const std::string& username) {
   }
 }
 
+void AccountTracker::SigninManagerCreated(SigninManagerBase* manager) {
+  manager->AddObserver(this);
+}
+
+void AccountTracker::SigninManagerShutdown(SigninManagerBase* manager) {
+  manager->RemoveObserver(this);
+}
+
 const std::string AccountTracker::signin_manager_account_id() {
   return SigninManagerFactory::GetForProfile(profile_)
       ->GetAuthenticatedAccountId();