Multiple account support in chrome.identity.getAuthToken

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 7c8db2cb1c0b60a0c7242b3db45481e9adce77e4..3cd3a98aa80b21919f212ccb4c204c9ca2777f51 100644
--- a/chrome/browser/extensions/api/identity/account_tracker.h
+++ b/chrome/browser/extensions/api/identity/account_tracker.h
@@ -64,6 +64,7 @@ class AccountTracker : public OAuth2TokenService::Observer,
   // have been fetched. The primary account for the profile will be first
   // in the vector. Additional accounts will be in order of their gaia IDs.
   std::vector<AccountIds> GetAccounts() const;
+  std::string FindAccountKeyByGaiaId(const std::string& gaia_id);
 
   // OAuth2TokenService::Observer implementation.
   virtual void OnRefreshTokenAvailable(const std::string& account_key) OVERRIDE;