https://bugs.webkit.org/show_bug.cgi?id=123394

Reviewed by Darin Adler.

All wrappers conform to a new WKObject protocol and contain the wrapped object inline.
APIObject-derived classes override operator new to call newObject, which allocates the
wrapper and returns a pointer to the inline API object.

There are three kinds of wrapper classes: (a) classes that inherit directly from NSObject
and implement their API by calling the wrapped object (example: WKBackForwardList),
(b) internal classes that inherit from a class cluster, and implement the primitive methods
of the class cluster by calling the wrapped object (example: WKNSArray), and (c) internal
classes that inerit from the new WKObject class, and proxy to an object of some public type,
which is created from the wrapped object (example: WKNSURL).

* Shared/APIObject.h:
(WebKit::APIObject::wrapper): Added this getter.
(WebKit::TypedAPIObject::operator new): Added override that calls newObject.
* Shared/Cocoa/APIObject.mm: Added.
(WebKit::APIObject::ref): Retains the wrapper.
(WebKit::APIObject::deref): Releases the wrapper. When the wrapper is deallocated, it calls
the API object destructor.
(WebKit::APIObject::newObject): Allocates the wrapper and returns a pointer to the API
object inside the wrapper.

* Shared/Cocoa/WKNSArray.h:
(WebKit::wrapper): Added. Returns an ImmutableArray’s wrapper as an NSArray.
Replaced the RefPtr<ImmutableArray> ivar with space for an ImmutableArray to live inside
the wrapper.
(-[WKNSArray dealloc]): Calls the ImmutableArray destructor.
(-[WKNSArray count]): Updated for ivar change.
(-[WKNSArray objectAtIndex:]): Ditto.
(-[WKNSArray _apiObject]): Returns the wrapped ImmutableArray.

* Shared/Cocoa/WKNSObjectExtras.h: Removed.
* Shared/Cocoa/WKNSObjectExtras.mm: Removed.

* Shared/Cocoa/WKNSString.h: Added.
* Shared/Cocoa/WKNSString.mm: Added.
(-[WKNSString _web_createTarget]): Override this WKObject method to create an NSString from
the WebString.
(-[WKNSString copyWithZone:]): Retains self.

* Shared/Cocoa/WKNSURL.h: Added.
* Shared/Cocoa/WKNSURL.mm: Added.
(-[WKNSURL _web_createTarget]): Override this WKObject method to create an NSURL from
the WebURL.
(-[WKNSURL copyWithZone:]): Retains self.

* Shared/Cocoa/WKObject.h: Added.
* Shared/Cocoa/WKObject.mm: Added.
(-[WKObject dealloc]): Calls the destructor of the wrapped object and releases the target
object.
(initializeTargetIfNeeded): Helper function. Tries to create the target exactly once.
(-[WKObject isEqual:]): NSObject override that creates and compares to the target
object if necessary.
(-[WKObject hash]): NSObject override that creates and hashes the target object if
there is one.
(-[WKObject isKindOfClass:]): NSObject override that delegates to the target object.
(-[WKObject isMemberOfClass:]): Ditto.
(-[WKObject respondsToSelector:]): NSObject override that creates the target object if
necessary and returns whether it or self responds to the selector.
(-[WKObject conformsToProtocol:]): Similarly for protocols.
(-[WKObject forwardingTargetForSelector:]): NSObject override that creates the target object
if necessary and returns it as the target.
(-[WKObject description]): NSObject override that creates the target object if necessary and
forwards to it.
(-[WKObject _web_createTarget]): Added. The base implementation returns nil.
(-[WKObject _apiObject]): Returns the wrapped object.

* UIProcess/API/mac/WKBrowsingContextController.mm:
(-[WKBrowsingContextController backForwardList]): Changed to return the existing wrapper.
(didChangeBackForwardList): Changed to use existing wrappers.

Replaced the RefPtr<WebBackForwardList> ivar with space for a WebBackForwardList to live
inside the wrapper.
(-[WKBackForwardList dealloc]): Call the WebBackForwardList destructor.
(toWKBackForwardListItem): Changed to us the existing wrapper.
(-[WKBackForwardList currentItem]): Updated for ivar change.
(-[WKBackForwardList backItem]): Ditto.
(-[WKBackForwardList forwardItem]): Ditto.
(-[WKBackForwardList itemAtIndex:]): Ditto.
(-[WKBackForwardList backListCount]): Ditto.
(-[WKBackForwardList forwardListCount]): Ditto,
(-[WKBackForwardList backListWithLimit:]): Ditto, and also changed to use the
ImmutableArray’s existing wrapper.
(-[WKBackForwardList forwardListWithLimit:]): Ditto.
(-[WKBackForwardList _apiObject]): Returns the WebBackForwardListItem.
* UIProcess/Cocoa/WKBackForwardListInternal.h:
(WebKit::wrapper): Added. Returns a WebBackForwardList’s wrapper as a WKBackForwardList.

* UIProcess/Cocoa/WKBackForwardListItem.mm:
Replaced the RefPtr<WebBackForwardListItem> ivar with space for a WebBackForwardListItem to
live inside the wrapper.
(-[WKBackForwardListItem dealloc]): Call the WebBackForwardListItem destructor.
(-[WKBackForwardListItem URL]): Updated for ivar change, and changed to make an NSURL
directly instead of going through a wrapper.
(-[WKBackForwardListItem title]): Updated for ivar change, and changed to use
String’s operator NSString*.
(-[WKBackForwardListItem originalURL]): Updated for ivar change, and changed to make an
NSURL directly instead of going through a wrapper.
(-[WKBackForwardListItem _apiObject]): Returns the WebBackForwardListItem.
(-[WKBackForwardListItem _item]): Ditto.
* UIProcess/Cocoa/WKBackForwardListItemInternal.h:
(WebKit::wrapper): Added. Returns a WebBackForwardListItem’s wrapper as a
WKBackForwardListItem.

* UIProcess/WebColorPickerResultListenerProxy.h: Changed into a TypedAPIObject.

* UIProcess/WebFormSubmissionListenerProxy.h:
(WebKit::WebFormSubmissionListenerProxy::operator new): Override to call newObject.

* UIProcess/WebFramePolicyListenerProxy.h:
(WebKit::WebFramePolicyListenerProxy::operator new): Ditto.

* WebKit2.xcodeproj/project.pbxproj: Updated for file additions and removals.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158324 268f45cc-cd09-0410-ab3c-d52691b4dbfc