Add state attribute to history's dom interface.

Add state attribute to history's dom interface.
https://bugs.webkit.org/show_bug.cgi?id=76035

Patch by Pablo Flouret <pablof@motorola.com> on 2012-02-08
Reviewed by Kentaro Hara.

Source/WebCore:

Tests: fast/loader/stateobjects/state-attribute-object-types.html
       fast/loader/stateobjects/state-attribute-only-one-deserialization.html

* bindings/js/JSHistoryCustom.cpp:
(WebCore::JSHistory::state):
(WebCore):
(WebCore::JSHistory::pushState):
(WebCore::JSHistory::replaceState):
* bindings/v8/custom/V8HistoryCustom.cpp:
(WebCore::V8History::stateAccessorGetter):
(WebCore):
(WebCore::V8History::pushStateCallback):
(WebCore::V8History::replaceStateCallback):
* page/History.cpp:
(WebCore::History::History):
(WebCore::History::state):
(WebCore):
(WebCore::History::stateInternal):
(WebCore::History::stateChanged):
* page/History.h:
(History):
* page/History.idl:

LayoutTests:

* fast/dom/Window/window-appendages-cleared-expected.txt:
* fast/loader/stateobjects/state-attribute-object-types-expected.txt: Added.
* fast/loader/stateobjects/state-attribute-object-types.html: Added.
* fast/loader/stateobjects/state-attribute-only-one-deserialization-expected.txt: Added.
* fast/loader/stateobjects/state-attribute-only-one-deserialization.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@107058 268f45cc-cd09-0410-ab3c-d52691b4dbfc