QLPreviewMenuItem popovers don't close when the page scrolls

QLPreviewMenuItem popovers don't close when the page scrolls
https://bugs.webkit.org/show_bug.cgi?id=140806
<rdar://problem/19555618>

Reviewed by Beth Dakin.

Now that QLPreviewMenuItem's popover doesn't eat scrolls, we need to dismiss it if the page scrolls.

* WebView/WebHTMLView.mm:
(-[WebHTMLView scrollWheel:scrollWheel:]):
Send scrollWheel along to WebImmediateActionController.

* WebView/WebImmediateActionController.h:
* WebView/WebImmediateActionController.mm:
(-[WebImmediateActionController webView:didHandleScrollWheel:]):
(-[WebImmediateActionController _clearImmediateActionState]):
(-[WebImmediateActionController _defaultAnimationController]):
Keep track of the active QLPreviewMenuItem, and close it upon scroll.

* UIProcess/API/mac/WKView.mm:
(-[WKView _dismissContentRelativeChildWindows]):
Send _dismissContentRelativeChildWindows on to WKImmediateActionController.

* UIProcess/mac/WKImmediateActionController.h:
* UIProcess/mac/WKImmediateActionController.mm:
(-[WKImmediateActionController _clearImmediateActionState]):
(-[WKImmediateActionController dismissContentRelativeChildWindows]):
(-[WKImmediateActionController _defaultAnimationController]):
Keep track of the active QLPreviewMenuItem, and close it upon scroll.

* platform/spi/mac/QuickLookMacSPI.h:
Add some SPI.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@179014 268f45cc-cd09-0410-ab3c-d52691b4dbfc