Source/JavaScriptCore: Make APIShims usable from WebCore.

Reviewed by Oliver Hunt.

* ForwardingHeaders/JavaScriptCore/APIShims.h: Added.
* GNUmakefile.am:
* JavaScriptCore.exp:
* JavaScriptCore.gypi:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCoreGenerated.make:
* JavaScriptCore.xcodeproj/project.pbxproj:

Source/WebCore: Use APIEntryShim instead of JSLock in SerializedScriptValue to allow it to be used
by contexts not created by WebCore.

https://webkit.org/b/55642

Reviewed by Oliver Hunt.

* bindings/js/SerializedScriptValue.cpp:
(WebCore::SerializedScriptValue::create): Use APIEntryShim instead of JSLock.
(WebCore::SerializedScriptValue::deserialize): Ditto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@80254 268f45cc-cd09-0410-ab3c-d52691b4dbfc