Prefix LOG and CHECK with AOS_

This prepares us for introducing glog more widely and transitioning
things over where they make sense.

Change-Id: Ic6c208882407bc2153fe875ffc736d66f5c8ade5
diff --git a/aos/util/phased_loop.cc b/aos/util/phased_loop.cc
index a349718..7369a93 100644
--- a/aos/util/phased_loop.cc
+++ b/aos/util/phased_loop.cc
@@ -1,8 +1,41 @@
 #include "aos/util/phased_loop.h"
 
+#include "glog/logging.h"
+
 namespace aos {
 namespace time {
 
+PhasedLoop::PhasedLoop(const monotonic_clock::duration interval,
+                       const monotonic_clock::time_point monotonic_now,
+                       const monotonic_clock::duration offset)
+    : interval_(interval), offset_(offset), last_time_(offset) {
+  CHECK(offset >= monotonic_clock::duration(0));
+  CHECK(interval > monotonic_clock::duration(0));
+  CHECK(offset < interval);
+  Reset(monotonic_now);
+}
+
+void PhasedLoop::set_interval_and_offset(
+    const monotonic_clock::duration interval,
+    const monotonic_clock::duration offset) {
+  interval_ = interval;
+  offset_ = offset;
+  CHECK(offset_ >= monotonic_clock::duration(0));
+  CHECK(interval_ > monotonic_clock::duration(0));
+  CHECK(offset_ < interval_);
+}
+
+monotonic_clock::duration PhasedLoop::OffsetFromIntervalAndTime(
+    const monotonic_clock::duration interval,
+    const monotonic_clock::time_point monotonic_trigger) {
+  CHECK(interval > monotonic_clock::duration(0));
+  return monotonic_trigger.time_since_epoch() -
+         (monotonic_trigger.time_since_epoch() / interval) * interval +
+         ((monotonic_trigger.time_since_epoch() >= monotonic_clock::zero())
+              ? monotonic_clock::zero()
+              : interval);
+}
+
 int PhasedLoop::Iterate(const monotonic_clock::time_point now) {
   const monotonic_clock::time_point next_time =
       monotonic_clock::time_point(
@@ -17,8 +50,8 @@
   const int result = difference / interval_;
   CHECK_EQ(
       0, (next_time - offset_).time_since_epoch().count() % interval_.count());
-  CHECK_GE(next_time, now);
-  CHECK_LE(next_time - now, interval_);
+  CHECK(next_time >= now);
+  CHECK(next_time - now <= interval_);
   last_time_ = next_time;
   return result;
 }