Add thread safety configuration check.

Enables the possibility to set thread model in the configuration
files (like Android does).
Also adds a warning check to make sure that we have an
implementation for the thread safety class.

Author: joakim.landberg@intel.com

Signed-off-by: Henrik Smiding <henrik.smiding@intel.com>

R=reed@google.com, mtklein@google.com, tomhudson@google.com, djsollen@google.com, joakim.landberg@intel.com, torne@chromium.org, scroggo@google.com

Author: henrik.smiding@intel.com

Review URL: https://codereview.chromium.org/361423003
1 file changed