[GCM] Check-in with signed in accounts associates device to user

components/gcm_driver/gcm_client.h

Index: components/gcm_driver/gcm_client.h
diff --git a/components/gcm_driver/gcm_client.h b/components/gcm_driver/gcm_client.h
index 8e0fb2f369d6fca14e13d819d869555fb0acb792..aeab63acab77e0d4e0e2fcb218dc572466ace3da 100644
--- a/components/gcm_driver/gcm_client.h
+++ b/components/gcm_driver/gcm_client.h
@@ -265,6 +265,15 @@ class GCMClient {
 
   // Gets internal states and statistics.
   virtual GCMStatistics GetStatistics() const = 0;
+
+  // Sets a list of accounts with OAuth2 tokens for the next checkin.
+  // |account_tokens| maps email addresses to OAuth2 access tokens.
+  // |account_removed| indicates that an account has been removed since the
+  //     last time the callback was called, which triggers an immediate checkin,
+  //     to ensure that association between device and account is removed.
+  virtual void SetAccountsForCheckin(
+      const std::map<std::string, std::string>& account_tokens,
+      bool account_removed) = 0;
 };
 
 }  // namespace gcm