Bug 1014299 - Add times() to seccomp whitelist. r=kang

This system call seems to be used by some versions of the Qualcomm Adreno
graphics drivers when we run WebGL apps.

security/sandbox/linux/SandboxFilter.cpp

@@ -152,6 +152,7 @@ SandboxFilterImpl::Build() {
   Allow(SYSCALL(getpid));
   Allow(SYSCALL(gettid));
   Allow(SYSCALL(getrusage));
+  Allow(SYSCALL(times));
   Allow(SYSCALL(madvise));
   Allow(SYSCALL(dup));
   Allow(SYSCALL(nanosleep));