Previously it interpreted its argument as being in DIPs, which was
perhaps more convenient, but inconsistent with most of the other
functions and broke the general rule that FromDIP() should be used with
all hard-coded sizes.
Update the sample to use FromDIP() when calling it now, improve the
documentation and fix a bug in AdjustToolBitmapSize() which resulted in
not increasing the bitmap size when moving toolbar sample using "large"
toolbar size from a standard DPI display to a high DPI one: the old code
considered that the new size was the same as the old one and returned
before comparing it with m_requestedBitmapSize, which resulted in the
bitmaps not changing size at all instead of doubling their size as they
were expected to.
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