Turned on PbufferImageTransportSurface as default image transport for vista and win 7 (not XP).

Also implemented PbufferImageTransportSurface::SetVisible by making the underlying surface 1x1 when it is not visible.

Review URL: http://codereview.chromium.org/8884001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113761 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed