TT#56376 selenium: backport wait_for_text() from master

FirefoxExtensions.pm:
- Added wait_for_text() from master. It will be very essential for future
fixes.

Change-Id: I7ead60d14a8ffa2146ea3c352679e70bacadeb63

t/lib/Selenium/Remote/Driver/FirefoxExtensions.pm

@@ -2,7 +2,7 @@ package Selenium::Remote::Driver::FirefoxExtensions;
 
 use warnings;
 use strict;
-
+use TryCatch;
 use Moo;
 
 use Test::More import => [qw(diag ok is)];
@@ -108,4 +108,19 @@ sub browser_name_in {
     return scalar grep {/^$browser_name$/} @names;
 }
 
+sub wait_for_text {
+    my ($self, $xpath, $expected, $timeout) = @_;
+    return unless $xpath && $expected;
+    $timeout = 5 unless $timeout; # seconds. Default timeout value if none is specified.
+    my $started = time();
+    my $elapsed = time();
+    while ($elapsed - $started <= $timeout){
+        $elapsed = time();
+        try{
+            return 1 if $self->find_element($xpath)->get_text() eq $expected;
+        };
+    }
+    return;
+}
+
 1;