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

chrome/browser/signin/about_signin_internals.cc

Index: chrome/browser/signin/about_signin_internals.cc
diff --git a/chrome/browser/signin/about_signin_internals.cc b/chrome/browser/signin/about_signin_internals.cc
index 294391768d2c78222bb63763d3932f65c3abcb85..263d3325fb1d5741a295c2b3f3e9790492f07426 100644
--- a/chrome/browser/signin/about_signin_internals.cc
+++ b/chrome/browser/signin/about_signin_internals.cc
@@ -156,6 +156,14 @@ void AboutSigninInternals::NotifySigninValueChanged(
   NotifyObservers();
 }
 
+void AboutSigninInternals::SigninManagerCreated(SigninManagerBase* manager) {
+  manager->AddSigninDiagnosticsObserver(this);
+}
+
+void AboutSigninInternals::SigninManagerShutdown(SigninManagerBase* manager) {
+  manager->RemoveSigninDiagnosticsObserver(this);
+}
+
 void AboutSigninInternals::RefreshSigninPrefs() {
   // Return if no profile exists. Can occur in unit tests.
   if (!profile_)
@@ -191,6 +199,7 @@ void AboutSigninInternals::Initialize(Profile* profile) {
 
   RefreshSigninPrefs();
 
+  SigninManagerFactory::GetInstance()->AddObserver(this);
   SigninManagerFactory::GetForProfile(profile)->
       AddSigninDiagnosticsObserver(this);
   ProfileOAuth2TokenServiceFactory::GetForProfile(profile)->
@@ -198,6 +207,7 @@ void AboutSigninInternals::Initialize(Profile* profile) {
 }
 
 void AboutSigninInternals::Shutdown() {
+  SigninManagerFactory::GetInstance()->RemoveObserver(this);
   SigninManagerFactory::GetForProfile(profile_)->
       RemoveSigninDiagnosticsObserver(this);
   ProfileOAuth2TokenServiceFactory::GetForProfile(profile_)->