wxHtmlWindow background drawing fixes for OS X and optimizations

wxHtmlWindow background drawing fixes for OS X and optimizations

1. Avoid crashes under OS X due to attempts to copy window contents to the
   backing store bitmap: this doesn't work under OS X so avoid it by always
   painting the background from OnPaint() itself, while still generating the
   erase background events for compatibility.

2. Don't double buffer wxHtmlWindow drawing if the window is already double
   buffered.

3. Don't allocate backing store bitmap on the heap, this is useless as bitmaps
   are already pointer-lile -- so just use invalid bitmap instead of NULL
   bitmap pointer.

4. Update the html/test sample to show the effects of custom erase background
   handler in wxHtmlWindow (it overrides the background bitmap painting).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61117 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775