[Desktop] Add diagnostics about loading the refresh tokens.

components/signin/core/browser/webdata/token_service_table.cc

Index: components/signin/core/browser/webdata/token_service_table.cc
diff --git a/components/signin/core/browser/webdata/token_service_table.cc b/components/signin/core/browser/webdata/token_service_table.cc
index 9333ba74cac8d5fc204dc5650b07b67aeb0e79a7..00f49269140c532a5d66718f3b0470b263537645 100644
--- a/components/signin/core/browser/webdata/token_service_table.cc
+++ b/components/signin/core/browser/webdata/token_service_table.cc
@@ -89,7 +89,7 @@ bool TokenServiceTable::SetTokenForService(const std::string& service,
   return s.Run();
 }
 
-bool TokenServiceTable::GetAllTokens(
+TokenServiceTable::Result TokenServiceTable::GetAllTokens(
     std::map<std::string, std::string>* tokens) {
   sql::Statement s(db_->GetUniqueStatement(
       "SELECT service, encrypted_token FROM token_service"));
@@ -98,9 +98,10 @@ bool TokenServiceTable::GetAllTokens(
     LOG(ERROR) << "Failed to load tokens (invalid SQL statement).";
     base::RecordAction(
         base::UserMetricsAction("Signin_TokenTable_GetAllTokensInvalidSql"));
-    return false;
+    return TOKEN_DB_RESULT_SQL_INVALID_STATEMENT;
   }
 
+  Result result = TOKEN_DB_RESULT_SUCCESS;
   while (s.Step()) {
     std::string encrypted_token;
     std::string decrypted_token;
@@ -119,12 +120,13 @@ bool TokenServiceTable::GetAllTokens(
         LOG(ERROR) << "Failed to decrypt token for service " << service;
         base::RecordAction(
             base::UserMetricsAction("Signin_TokenTable_DecryptFailed"));
+        result = TOKEN_DB_RESULT_DECRYPT_ERROR;
       }
     } else {
       LOG(ERROR) << "Bad token entry for service " << service;
       base::RecordAction(base::UserMetricsAction("Signin_TokenTable_BadEntry"));
-      return false;
+      result = TOKEN_DB_RESULT_BAD_ENTRY;
     }
   }
-  return true;
+  return result;
 }