Implement nacl_irt_clock for non-sfi mode.

components/nacl/loader/nonsfi/abi_conversion.cc

Index: components/nacl/loader/nonsfi/abi_conversion.cc
diff --git a/components/nacl/loader/nonsfi/abi_conversion.cc b/components/nacl/loader/nonsfi/abi_conversion.cc
index 59771062bf41ba77a53aeee524e9a26a39bcf3dc..2cdb5dc8b8ad48a9b6e26d19caab77f4e9980ecd 100644
--- a/components/nacl/loader/nonsfi/abi_conversion.cc
+++ b/components/nacl/loader/nonsfi/abi_conversion.cc
@@ -13,6 +13,18 @@
 namespace nacl {
 namespace nonsfi {
 
+void NaClAbiTimeSpecToTimeSpec(const struct nacl_abi_timespec& nacl_timespec,
+                               struct timespec* host_timespec) {
+  host_timespec->tv_sec = nacl_timespec.tv_sec;
+  host_timespec->tv_nsec = nacl_timespec.tv_nsec;
+}
+
+void TimeSpecToNaClAbiTimeSpec(const struct timespec& host_timespec,
+                               struct nacl_abi_timespec* nacl_timespec) {
+  nacl_timespec->tv_sec = host_timespec.tv_sec;
+  nacl_timespec->tv_nsec = host_timespec.tv_nsec;
+}
+
 void StatToNaClAbiStat(
     const struct stat& host_stat, struct nacl_abi_stat* nacl_stat) {
   // Some fields in host_stat, such as st_dev, group/other bits of mode and