[grid] Get TZ from parent container when not passed as cap.

Fixes SeleniumHQ#11289

Author: diemol

java/src/org/openqa/selenium/grid/node/docker/DockerSessionFactory.java

@@ -313,8 +313,8 @@ private Map<String, String> getBrowserContainerEnvVars(Capabilities sessionReque
  timeZone.ifPresent(zone -> envVars.put("TZ", zone.getID()));
  // Passing env vars set to the child container
  Map<String, String> seEnvVars = System.getenv();
- seEnvVars.entrySet()
- .stream().filter(entry -> entry.getKey().startsWith("SE_"))
+ seEnvVars.entrySet().stream()
+ .filter(entry -> entry.getKey().startsWith("SE_"))
  .forEach(entry -> envVars.put(entry.getKey(), entry.getValue()));
  return envVars;
  }
@@ -373,11 +373,15 @@ private TimeZone getTimeZone(Capabilities sessionRequestCapabilities) {
  Optional<Object> timeZone =
  ofNullable(sessionRequestCapabilities.getCapability("se:timeZone"));
  if (timeZone.isPresent()) {
- String tz =  timeZone.get().toString();
+ String tz = timeZone.get().toString();
  if (Arrays.asList(TimeZone.getAvailableIDs()).contains(tz)) {
  return TimeZone.getTimeZone(tz);
  }
  }
+ String envTz = System.getenv("TZ");
+ if (Arrays.asList(TimeZone.getAvailableIDs()).contains(envTz)) {
+ return TimeZone.getTimeZone(envTz);
+ }
  return null;
  }