Improve debug description of WAKViews

Improve debug description of WAKViews
https://bugs.webkit.org/show_bug.cgi?id=137716

Reviewed by Simon Fraser.

Source/WebCore:

No new tests because there is no behavior change.

* platform/ios/wak/WAKView.mm:
(-[WAKView description]):
* platform/ios/wak/WKView.h:
* platform/ios/wak/WKView.mm:
(WKViewGetOrigin):

Source/WebKit/mac:

* WebView/WebView.mm:
(-[WebView _touchEventRegions]): Adding a comment.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@174704 268f45cc-cd09-0410-ab3c-d52691b4dbfc