Move most of ui/views/drag_utils to ui/base/dragdrop so it can be used outside of views. I tried to…

Move most of ui/views/drag_utils to ui/base/dragdrop so it can be used outside of views. I tried to move SetURLAndDragImage as well, but that would cause a lot of code duplication from Views' TextButton class that would make us worse off (things like mirroring and limiting size).

BUG=98716
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=124923

[sky, 2012-03-05 05:12:33]

LGTM

[Nico, 2012-03-08 18:25:34]

This breaks the (work-in-progress) components build on mac: drag_utils.cc uses
drag_utils::SetDragImageOnDataObject(SkBitmap const&, gfx::Size const&,
gfx::Point const&, ui::OSExchangeData*) which isn't defined anywhere for mac. In
the normal build, that's fine, since drag_utils.cc isn't referenced so the
linker just ignores this .o file. But in the components build,
drag_utils::SetDragImageOnDataObject(gfx::Canvas const&, gfx::Size const&,
gfx::Point const&, ui::OSExchangeData*) is marked as _EXPORT, so it can't do
that.

I guess the right fix is to put these files in a os!="mac" block.