Move skia extensions from the port to skia/ext.

Move skia extensions from the port to skia/ext for Windows only. Fixed the
include guards of the moved files, but nothing else.

[brettw, 2008-11-21 21:04:32]

This still leaves a trail of headers all over the place. (base/gfx, and
port/...) which will be cleaned up in a later pass.

[Peter Kasting, 2008-11-21 21:13:03]

Rubber-stamp LGTM with nit.

http://codereview.chromium.org/11568/diff/106/300
File chrome/chrome.sln (left):

http://codereview.chromium.org/11568/diff/106/300#oldcode576
Line 576: {5597AD47-3494-4750-A235-4F9C2F864700} =
{5597AD47-3494-4750-A235-4F9C2F864700}
Did you intend this change?

[Peter Kasting, 2008-12-01 23:05:44]

Brett, did you ever check this in?  It shows as still open.

[Peter Kasting, 2009-01-30 21:53:26]

Ping, what happened with this?