WebCLProgram

Add stress test for WebCLProgram.

        Reviewed by NOBODY (OOPS!).

        * webcl/resources/webcl-test-utils.js:
        * webcl/resources/webcl-test.js:
        (WebCLTest):
        * webcl/tests/webcl-stress-program-expected.txt: Added.
        * webcl/tests/webcl-stress-program.html: Added.