LibJS: Show run-tests progress in the taskbar

Use the window progress escape sequence to indicate how far along in
the test collection we are while running tests. :^)

Libraries/LibJS/Tests/run-tests.sh

@@ -12,8 +12,14 @@ fi
 pass_count=0
 fail_count=0
 count=0
+test_count=0
 
 GLOBIGNORE=test-common.js
+
+for f in *.js; do
+    (( ++test_count ))
+done
+
 for f in *.js; do
     result="$("$js_program" "$@" -t "$f" 2>/dev/null)"
     if [ "$result" = "PASS" ]; then
@@ -23,10 +29,13 @@ for f in *.js; do
         echo -ne "( \033[31;1mFail\033[0m ) "
         (( ++fail_count ))
     fi
+    echo -ne "\033]9;${count};${test_count}\033\\"
     echo "$f"
     (( ++count ))
 done
 
+echo -e "\033]9;-1\033\\"
+
 pass_color=""
 fail_color=""
 color_off="\033[0m"