Should have copy and paste items in all text menus

Should have copy and paste items in all text menus
https://bugs.webkit.org/show_bug.cgi?id=139510
<rdar://problem/19198388>

Reviewed by Beth Dakin.

* UIProcess/mac/WKActionMenuController.mm:
(-[WKActionMenuController _defaultMenuItemsForText]):
Add a disabled paste menu item into the read-only text menu.

(-[WKActionMenuController _defaultMenuItemsForWhitespaceInEditableArea]):
Add a disabled copy menu item into the editable whitespace text menu.

* WebView/WebActionMenuController.mm:
(-[WebActionMenuController _defaultMenuItemsForText]):
Add a disabled paste menu item into the read-only text menu.

(-[WebActionMenuController _defaultMenuItemsForWhitespaceInEditableArea]):
Add a disabled copy menu item into the editable whitespace text menu.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@177111 268f45cc-cd09-0410-ab3c-d52691b4dbfc