I defined a menu item that has ShareActionProvider and share white icon like so :
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try this :
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.MENU, menu);
// change color for icon 0
Drawable yourdrawable = menu.getItem(0).getIcon(); // change 0 with 1,2 ...
yourdrawable.mutate();
yourdrawable.setColorFilter(getResources().getColor(R.color.white), PorterDuff.Mode.SRC_IN);
return true;
}