Implemented openfl.display.BitmapData#histogram method in HTML5 backend.
Implemented openfl.display.BitmapData#histogram method in HTML5 backend.

NenadBojkovski/openfl,NenadBojkovski/openfl,Gama11/openfl,Gama11/openfl,openfl/openfl,Gama11/openfl,openfl/openfl,Gama11/openfl,openfl/openfl