[Android] Add WebCL conformance test suites.

Include WebCL conformance test suites from upstream
(https://github.com/KhronosGroup/WebCL-conformance)
in the Crosswalk DEPS. It's used for tracking WebCL
API implementation following the spec, supposed to
integrate into buildbot for auto verification in
future.

It contains bindingTesting, extension, functionalityTesting
and security four components.

BUG=XWALK-2552

Author: junmin-zhu

Diff for: DEPS.xwalk

@@ -55,6 +55,11 @@ solutions = [
         'https://cvs.khronos.org/svn/repos/registry/trunk/public/cl/api/1.2@'
            '28150',
 
+      # Include WebCL conformance test suite.
+      'src/third_party/webcl/src':
+        'https://github.com/KhronosGroup/WebCL-conformance.git@'
+           'master',
+
       # These directories are not relevant to Crosswalk and can be safely ignored
       # in a checkout. It avoids creating additional directories outside src/ that
       # are not used and also saves some bandwidth.