Move Timer from init to libbase

Test: boot bullhead
Test: new libbase unit tests

Change-Id: Ic398a1daa1fe92c10ea7bc1e6ac3f781cee9a5b5
diff --git a/base/chrono_utils.cpp b/base/chrono_utils.cpp
index 5eedf3b..b6bf701 100644
--- a/base/chrono_utils.cpp
+++ b/base/chrono_utils.cpp
@@ -33,5 +33,10 @@
 #endif  // __ANDROID__
 }
 
+std::ostream& operator<<(std::ostream& os, const Timer& t) {
+  os << t.duration().count() << "ms";
+  return os;
+}
+
 }  // namespace base
 }  // namespace android