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

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

Index: chrome/browser/extensions/api/identity/account_tracker.h
diff --git a/chrome/browser/extensions/api/identity/account_tracker.h b/chrome/browser/extensions/api/identity/account_tracker.h
index 8c14daf859803c21e35b657af11ed1adb2aa8405..331fb7d33b719e7353c9e2b41ad428277f86fb7e 100644
--- a/chrome/browser/extensions/api/identity/account_tracker.h
+++ b/chrome/browser/extensions/api/identity/account_tracker.h
@@ -10,6 +10,7 @@
 
 #include "base/observer_list.h"
 #include "chrome/browser/signin/signin_manager_base.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
 #include "components/signin/core/browser/signin_error_controller.h"
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "google_apis/gaia/oauth2_token_service.h"
@@ -38,7 +39,8 @@ class AccountIdFetcher;
 // 4. If there is no primary account, there are no other accounts.
 class AccountTracker : public OAuth2TokenService::Observer,
                        public SigninErrorController::AuthStatusProvider,
-                       public SigninManagerBase::Observer {
+                       public SigninManagerBase::Observer,
+                       public SigninManagerFactory::Observer {
  public:
   explicit AccountTracker(Profile* profile);
   virtual ~AccountTracker();
@@ -76,6 +78,10 @@ class AccountTracker : public OAuth2TokenService::Observer,
                                      const std::string& password) OVERRIDE;
   virtual void GoogleSignedOut(const std::string& username) OVERRIDE;
 
+  // SigninManagerFactory::Observer:
+  virtual void SigninManagerCreated(SigninManagerBase* manager) OVERRIDE;
+  virtual void SigninManagerShutdown(SigninManagerBase* manager) OVERRIDE;
+
  private:
   struct AccountState {
     AccountIds ids;