[iOS] did{Start,Finish}LoadForQuickLookDocumentInMainFrame is never called on WKNavig...

[iOS] did{Start,Finish}LoadForQuickLookDocumentInMainFrame is never called on WKNavigationDelegate
https://bugs.webkit.org/show_bug.cgi?id=149360

Reviewed by Tim Horton.

Source/WebKit2:

* UIProcess/ios/WebPageProxyIOS.mm:
(WebKit::WebPageProxy::didStartLoadForQuickLookDocumentInMainFrame): Called on m_navigationDelegate if non-null.
(WebKit::WebPageProxy::didFinishLoadForQuickLookDocumentInMainFrame): Ditto.

Tools:

Added an API test.

* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WebKit2Cocoa/QuickLook.mm: Added.
(-[QuickLookNavigationDelegate _webView:didStartLoadForQuickLookDocumentInMainFrameWithFileName:uti:]):
(-[QuickLookNavigationDelegate _webView:didFinishLoadForQuickLookDocumentInMainFrame:]):
(-[QuickLookNavigationDelegate webView:didFinishNavigation:]):
(TEST):
* TestWebKitAPI/ios/pages.pages: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@189997 268f45cc-cd09-0410-ab3c-d52691b4dbfc