[chromedriver] Implement command: executeAsyncScript and setScriptTimeout

chrome/test/chromedriver/status.cc

Index: chrome/test/chromedriver/status.cc
diff --git a/chrome/test/chromedriver/status.cc b/chrome/test/chromedriver/status.cc
index efd253fcfaca0fbae452cb87bfbfd441e03d5594..062549aba2abf1a54f3f32a5abda877e66f00551 100644
--- a/chrome/test/chromedriver/status.cc
+++ b/chrome/test/chromedriver/status.cc
@@ -25,8 +25,12 @@ const char* DefaultMessageForStatusCode(StatusCode code) {
       return "invalid element state";
     case kUnknownError:
       return "unknown error";
+    case kJavaScriptError:
+      return "javascript error";
     case kXPathLookupError:
       return "xpath lookup error";
+    case kTimeout:
+      return "asynchronous script timeout";
     case kNoSuchWindow:
       return "no such window";
     case kUnexpectedAlertOpen: