https://bugs.webkit.org/show_bug.cgi?id=123462

Reviewed by Sam Weinig.

* WebCore.xcodeproj/project.pbxproj: Added new files.

* crypto/CryptoAlgorithmIdentifier.h: Added an enum with all registered algorithms
(they don't have to be all implemented in any port).

* crypto/CryptoKey.cpp:
(WebCore::CryptoKey::CryptoKey): Initialize base class variables.
(WebCore::CryptoKey::type): Convert internal representation for bindings use.
(WebCore::CryptoKey::buildAlgorithmDescription): Ditto. This function is supposed
to be called by derived classes before adding other keyes.
(WebCore::CryptoKey::usages): Convert internal representation for bindings use.

* crypto/CryptoKey.h:
(WebCore::CryptoKey::extractable): Expose for bindings.
(WebCore::CryptoKey::allows): A faster way to check allowed key usage from C++ code.

* crypto/CryptoKey.idl: Added SkipVTableValidation, because validation doesn't work
with derived classes. Corrected "usages" attribute name.

* crypto/CryptoKeyFormat.h: Added. 
* crypto/CryptoKeyType.h: Added.
* crypto/CryptoKeyUsage.h: Added.
Added enums used by CryptoKey.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158236 268f45cc-cd09-0410-ab3c-d52691b4dbfc