Returns the displayable list of short timezone names paired with its id for
the current locale, selected based on the region or language provided.
This method depends on goog.locale.TimeZone*__<locale> available
from http://go/js_locale_data. Users of this method must add a dependency on
this.
| Parameters | | opt_regionOrLang | string= | | If region tag is provided, timezone ids
specific this region are considered. If language is provided, all regions
for which this language is defacto official is considered. If
this parameter is not speficied, current locale is used to
extract this information.
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| Returns | Array<(Object|null)> | Localized and relevant list of timezone names
and ids.
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