New Profile metric for Auth Errors.

chrome/browser/signin/chrome_signin_client.h

Index: chrome/browser/signin/chrome_signin_client.h
diff --git a/chrome/browser/signin/chrome_signin_client.h b/chrome/browser/signin/chrome_signin_client.h
index 3a21c0b31433863402b4c00edd46d27a39a4975e..a278b9c4b820734cd9cccd25c754a74bbd417b69 100644
--- a/chrome/browser/signin/chrome_signin_client.h
+++ b/chrome/browser/signin/chrome_signin_client.h
@@ -65,6 +65,9 @@ class ChromeSigninClient : public SigninClient,
                     const std::string& username,
                     const std::string& password) override;
 
+  // Overridden from SigninErrorController::Observer
+  void OnErrorChanged() override;

[noms (inactive), 2015/01/08 21:49:04]

nit: change to "SigninErrorController::Observer implemetation." to match the
other 2 overrides in the file.

[Mike Lerman, 2015/01/09 02:15:04]

Done.

+
  private:
   Profile* profile_;