Provide working printing support for WinCairo port.
Reviewed by Adam Roben.
* WebFrame.cpp:
(WebFrame::spoolPage): Conditionalize initialization of
PlatformGraphicsContext handling for CG vs. Cairo.
(scaleFactor): Add helper function.
(hdcFromContext): Add helper function.
(WebFrame::drawHeader): Correct Cairo variation.
(WebFrame::drawFooter): Correct Cairo variation.
(WebFrame::spoolPages): Correct Cairo variation.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@52121 268f45cc-cd09-0410-ab3c-d52691b4dbfc