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

chrome/browser/services/gcm/gcm_profile_service.h

Index: chrome/browser/services/gcm/gcm_profile_service.h
diff --git a/chrome/browser/services/gcm/gcm_profile_service.h b/chrome/browser/services/gcm/gcm_profile_service.h
index 75eefe659049985d7dac4b7d80c6f5eb2f6f08e1..f53273436086e62e79235883e6f07c1410d04cea 100644
--- a/chrome/browser/services/gcm/gcm_profile_service.h
+++ b/chrome/browser/services/gcm/gcm_profile_service.h
@@ -16,6 +16,7 @@
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/services/gcm/default_gcm_app_handler.h"
 #include "chrome/browser/signin/signin_manager_base.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -40,7 +41,8 @@ class GCMProfileServiceTestConsumer;
 // Acts as a bridge between GCM API and GCMClient layer. It is profile based.
 class GCMProfileService : public KeyedService,
                           public content::NotificationObserver,
-                          public SigninManagerBase::Observer {
+                          public SigninManagerBase::Observer,
+                          public SigninManagerFactory::Observer {
  public:
   typedef base::Callback<void(const std::string& registration_id,
                               GCMClient::Result result)> RegisterCallback;
@@ -147,6 +149,10 @@ class GCMProfileService : public KeyedService,
                                      const std::string& password) OVERRIDE;
   virtual void GoogleSignedOut(const std::string& username) OVERRIDE;
 
+  // Overridden from SigninManagerFactory::Observer:
+  virtual void SigninManagerCreated(SigninManagerBase* manager) OVERRIDE;
+  virtual void SigninManagerShutdown(SigninManagerBase* manager) OVERRIDE;
+
   // Ensures that the GCMClient is loaded and the GCM check-in is done when
   // the profile was signed in.
   void EnsureLoaded();