ART: Add three Timer functions

Add support for GetAvailableProcessors, GetTimerInfo and GetTime.
Add tests.

Bug: 31455788
Test: m test-art-host-run-test-926-timers
Change-Id: I9629654349787e27dee686284567b5de70e138f2
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index 6068876..55cef97 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -304,6 +304,7 @@
   923-monitors \
   924-threads \
   926-multi-obsolescence \
+  927-timers \
 
 ifneq (,$(filter target,$(TARGET_TYPES)))
   ART_TEST_KNOWN_BROKEN += $(call all-run-test-names,target,$(RUN_TYPES),$(PREBUILD_TYPES), \