2013-04-09  Diego Pinheiro  <diego.qp@samsung.com>

Add stress test for WebCLContext.

        Reviewed by NOBODY (OOPS!).

        * webcl/resources/webcl-test.js: Add a variable for device type.
        (WebCLTest):
        * webcl/tests/webcl-stress-context-expected.txt: Added.
        * webcl/tests/webcl-stress-context.html: Added.