https://bugs.webkit.org/show_bug.cgi?id=124556

Reviewed by Dan Bernstein.

* Scripts/webkit2/messages.py:
(struct_or_class):
Mark WebPageGroupData as a struct.

* Shared/UserMessageCoders.h:
* Shared/mac/ObjCObjectGraphCoders.h:
* Shared/mac/ObjCObjectGraphCoders.mm:
* WebProcess/InjectedBundle/InjectedBundleUserMessageCoders.h:
* UIProcess/WebConnectionToWebProcess.cpp:
* UIProcess/WebContext.cpp:
* UIProcess/WebContextUserMessageCoders.h:
* UIProcess/WebPageProxy.cpp:
* UIProcess/WebPageProxy.h:
Pass the WebProcess/WebProcessProxy to both encode and decode.

* Shared/WebPageCreationParameters.h:
Pass the page group by ID when creating a page, as it will have had its own
creation message sent already.

* UIProcess/WebPageGroup.cpp:
* UIProcess/WebPageGroup.h:
Keep track of processes.

* UIProcess/WebProcessProxy.cpp:
* UIProcess/WebProcessProxy.h:
Keep track of the page groups used by the process.

* WebProcess/WebPage/WebPage.cpp:
Get the already create page group on creation.

* WebProcess/WebProcess.cpp:
* WebProcess/WebProcess.h:
* WebProcess/WebProcess.messages.in:
Explicitly create page groups in the WebProcess.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159740 268f45cc-cd09-0410-ab3c-d52691b4dbfc