OffScreen - Simplify BitmapBuffer.ResizeBuffer
OffScreen - Simplify BitmapBuffer.ResizeBuffer

Was using Array.Resize to modify the existing array, unfortunately this doesn't yield the performance result the name implies.
A new array is created and copies elements from the old array, so performance is actually worse than allocating a new array.
For now we'll just create a new empty array.

https://msdn.microsoft.com/en-us/library/bb348051(v=vs.110).aspx

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