Reviewed by Nate Chapin.

        bufferSubData causes crash in WebGLBuffer::associateBufferSubData
        https://bugs.webkit.org/show_bug.cgi?id=42004

        Test: fast/canvas/webgl/index-validation-crash-with-buffer-sub-data.html

        * html/canvas/WebGLBuffer.cpp:
        (WebCore::WebGLBuffer::associateBufferData):
         - Allocate m_elementArrayBuffer for entry point taking only size.
           Guard against allocation failures of m_elementArrayBuffer.
        (WebCore::WebGLBuffer::associateBufferSubData):
         - Guard against any possibility of crashes due to m_elementArrayBuffer being NULL.
2010-07-09  Kenneth Russell  <kbr@google.com>

        Reviewed by Nate Chapin.

        bufferSubData causes crash in WebGLBuffer::associateBufferSubData
        https://bugs.webkit.org/show_bug.cgi?id=42004

        * fast/canvas/webgl/index-validation-crash-with-buffer-sub-data-expected.txt: Added.
        * fast/canvas/webgl/index-validation-crash-with-buffer-sub-data.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@63017 268f45cc-cd09-0410-ab3c-d52691b4dbfc