[chromedriver] Implement commands: findChildElement, findChildElements.

chrome/test/chromedriver/status.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/test/chromedriver/status.h"
 
 namespace {
 
 // Returns the string equivalent of the given |ErrorCode|.
 const char* DefaultMessageForStatusCode(StatusCode code) {
   switch (code) {
     case kOk:
       return "ok";
     case kNoSuchElement:
       return "no such element";
     case kUnknownCommand:
       return "unknown command";
+    case kStaleElementReference:
+      return "stale element reference";
     case kUnknownError:
       return "unknown error";
     case kXPathLookupError:
       return "xpath lookup error";
     case kInvalidSelector:
       return "invalid selector";
     case kSessionNotCreatedException:
       return "session not created exception";
     case kNoSuchSession:
       return "no such session";
@@ skipping 37 matching lines @@
   return code_ != kOk;
 }
 
 StatusCode Status::code() const {
   return code_;
 }
 
 const std::string& Status::message() const {
   return msg_;
 }