1422991602
This function replaces some uses of GetContentScaleFactor(), where a factor greater than 1 must be used even under the platforms not doing any logical/physical pixel mapping, such as MSW. For now GetContentScaleFactor() is still unchanged, but it will return 1 for such platforms in the future and adding GetDPIScaleFactor() allows to avoid changing the behaviour of the code which relied on its current behaviour.