Reviewed by James Robinson.

        [chromium] Cannot create stencil render-buffer for accelerated drawing on desktop GL
        https://bugs.webkit.org/show_bug.cgi?id=61444

        Used DEPTH24_STENCIL8 format for stencil buffer instead of STENCIL_INDEX8.
        Packed depth-stencil buffer is the most common format supported by graphics cards.
        It is not very robust to rely on just one format being supported,
        so long term the task of creating FBO should be delegated to SKIA,
        which has necessary code to iterate through all possible formats.

        * platform/graphics/chromium/LayerTextureUpdaterCanvas.cpp:
        (WebCore::LayerTextureUpdaterSkPicture::deleteFrameBuffer):
        (WebCore::LayerTextureUpdaterSkPicture::createFrameBuffer):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87365 268f45cc-cd09-0410-ab3c-d52691b4dbfc