Initilize the WebPageProxy intrinsicDeviceScaleFactor on creation of the WKView.
If WKView was created and loaded a page with canvas elements before beinging moved to a window, the canvas elements would be locked in at a pixel ratio of 1. With this change the WKView will use the main screen's pixel ratio until it moves to a window. Reviewed by Anders Carlsson. * UIProcess/API/mac/WKView.mm: (-[WKView initWithFrame:contextRef:pageGroupRef:]): Call setIntrinsicDeviceScaleFactor. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@107017 268f45cc-cd09-0410-ab3c-d52691b4dbfc