https://bugs.webkit.org/show_bug.cgi?id=93673

Reviewed by Ryosuke Niwa.

Use NSWindow SPI and override -backingScaleFactor so that WKTR and DRT
windows on 2x machines still run at 1x.

* DumpRenderTree/mac/DumpRenderTree.mm:
(createWebViewAndOffscreenWindow):
Reset the window resolution to 1x on creation.
* DumpRenderTree/mac/DumpRenderTreeWindow.h: Add NSWindow details.
* DumpRenderTree/mac/DumpRenderTreeWindow.mm:
(-[DumpRenderTreeWindow backingScaleFactor]): Override, always return 1.
* WebKitTestRunner/mac/PlatformWebViewMac.mm:
(-[WebKitTestRunnerWindow backingScaleFactor]): Override, always return 1.
(WTR::PlatformWebView::PlatformWebView):
Add NSWindow details, reset the window resolution to 1x on creation.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146650 268f45cc-cd09-0410-ab3c-d52691b4dbfc