Add transfer map argument to Intent constructor

Add transfer map argument to Intent constructor
http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html
This adds the ability to pass transferables (i.e. MessagePorts)
through web intents, and puts the calling convention in line
with the Web Messaging spec:
http://dev.w3.org/html5/postmsg/

Implementation in chromium API follows the port-passing method
of PlatformMessagePortChannel.

https://bugs.webkit.org/show_bug.cgi?id=80200

Patch by Greg Billock <gbillock@google.com> on 2012-04-09
Reviewed by Adam Barth.

* Modules/intents/Intent.cpp:
(WebCore::Intent::create):
* Modules/intents/Intent.idl:
* WebCore.gypi:
* bindings/v8/custom/V8IntentCustom.cpp: Added.
(WebCore):
(WebCore::V8Intent::constructorCallback):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113656 268f45cc-cd09-0410-ab3c-d52691b4dbfc