Maps the stored "Layout" preference value to the browser layout to launch: the classic tab activity or the new tab-less one.
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Maps the stored "Layout" preference value to the browser layout to launch: the classic tab activity or the new tab-less one.
Only an explicit STORED_CLASSIC resolves to classic; anything else (null, empty, unknown, differently cased) resolves to the new layout, so an install without a stored value (a fresh install or an update from a version that had no "Layout" setting) starts in the new layout. The preference default (res/xml/preference.xml) is DEFAULT_STORED_VALUE as well.
Deliberately has no android.* imports so it can be unit-tested on the plain JVM, like DeviceSessionGrouper.