https://bugs.webkit.org/show_bug.cgi?id=88768

Reviewed by Hajime Morita.

.:

* Source/autotools/symbols.filter: Expose some symbols used by Internals.cpp.

Source/WebCore:

Reject invalid form state vectors. This state vectors are generated by
WebKit itself. However it can be invalid because
- Serialized state vectors can be corrupted
- A future version of WebKit might change the format

So we had better reject unexpected state vectors as possible.

Test: fast/forms/state-restore-broken-state.html

* WebCore.exp.in: Expose some symbols used by Internals.cpp.
* html/FormController.cpp:
(WebCore::isNotFormControlTypeCharacter): A helper for state validation.
(WebCore::FormController::setStateForNewFormElements):
Reject state vectors of which size is not a multiple of 3, or a type name is invalid.
* testing/Internals.cpp:
(WebCore::Internals::formControlStateOfPreviousHistoryItem):
Returns a form state vector of the previous document.
(WebCore::Internals::setFormControlStateOfPreviousHistoryItem):
Sets a form state vector for the previous document.
* testing/Internals.h: Declare new functions.
* testing/Internals.idl: ditto.

Source/WebKit2:

* win/WebKit2.def: Expose some symbols used by Internals.cpp.
* win/WebKit2CFLite.def: ditto.

LayoutTests:

* fast/forms/resources/state-restore-broken-state-1.html: Added.
* fast/forms/resources/state-restore-broken-state-2.html: Added.
* fast/forms/state-restore-broken-state-expected.txt: Added.
* fast/forms/state-restore-broken-state.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@120397 268f45cc-cd09-0410-ab3c-d52691b4dbfc