Ref protect shaders in V8WebGLRenderingContext::getAttachedShadersCallback

Ref protect shaders in V8WebGLRenderingContext::getAttachedShadersCallback
https://bugs.webkit.org/show_bug.cgi?id=68630

Patch by Sergey Glazunov <serg.glazunov@gmail.com> on 2011-09-22
Reviewed by Adam Barth.

Source/WebCore:

Test: fast/canvas/webgl/shader-deleted-by-accessor.html

* bindings/js/JSWebGLRenderingContextCustom.cpp:
(WebCore::JSWebGLRenderingContext::getAttachedShaders):
* bindings/v8/custom/V8WebGLRenderingContextCustom.cpp:
(WebCore::V8WebGLRenderingContext::getAttachedShadersCallback):
* html/canvas/WebGLRenderingContext.cpp:
(WebCore::WebGLRenderingContext::getAttachedShaders):
* html/canvas/WebGLRenderingContext.h:

LayoutTests:

* fast/canvas/webgl/shader-deleted-by-accessor-expected.txt: Added.
* fast/canvas/webgl/shader-deleted-by-accessor.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95728 268f45cc-cd09-0410-ab3c-d52691b4dbfc