Log ChromeToMobile search and auth errors to UMA and INFO.

google_apis/gaia/google_service_auth_error.h

Index: google_apis/gaia/google_service_auth_error.h
diff --git a/google_apis/gaia/google_service_auth_error.h b/google_apis/gaia/google_service_auth_error.h
index ea434bda93343316fa6eed197c7841862dead6f0..a4747aca3d9f67856bba58126990374901165797 100644
--- a/google_apis/gaia/google_service_auth_error.h
+++ b/google_apis/gaia/google_service_auth_error.h
@@ -77,6 +77,9 @@ class GoogleServiceAuthError {
     // The user has provided a HOSTED account, when this service requires
     // a GOOGLE account.
     HOSTED_NOT_ALLOWED = 10,
+
+    // The number of known error states.
+    NUM_STATES = 11,
   };
 
   // Additional data for CAPTCHA_REQUIRED errors.