More WKRemoteObjectRegistry work

More WKRemoteObjectRegistry work
https://bugs.webkit.org/show_bug.cgi?id=123754

Reviewed by Dan Bernstein.

Source/WebKit2:

* Shared/API/Cocoa/WKRemoteObjectCoder.h:
* Shared/API/Cocoa/WKRemoteObjectCoder.mm:
(-[WKRemoteObjectEncoder rootObjectDictionary]):
Add a getter for the root object dictionary.

* Shared/API/Cocoa/WKRemoteObjectRegistry.mm:
(-[WKRemoteObjectRegistry _sendInvocation:interface:]):
Call _sendMessageWithBody:.
(-[WKRemoteObjectRegistry _sendMessageWithBody:]):
Call WebConnection::postMessage.

Tools:

* TestWebKitAPI/Tests/WebKit2ObjC/WKRemoteObjectRegistry.mm:
(TestWebKitAPI::TEST):
Use the correct bundle test name. Call Util::run.

* TestWebKitAPI/Tests/mac/WKRemoteObjectRegistry_Bundle.mm:
(-[BundleObject sayHello]):
(-[BundleObject testMethodWithString:double:integer:]):
Add BundleObject implementation. Register the bundle object with
the remote object registry. Call _handleMessageWithName:body: on the incoming message.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@158595 268f45cc-cd09-0410-ab3c-d52691b4dbfc