Implement DDMS heap info ("HPIF") chunks.

This lets you see how many bytes/objects are in your managed heap.

Change-Id: Ie925207e9c48989a24968633e60b99314d220865
diff --git a/src/utils.h b/src/utils.h
index bf8191e..bb307d1 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -209,6 +209,9 @@
 // Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
 std::string GetIsoDate();
 
+// Returns the current time in milliseconds (using the POSIX CLOCK_MONOTONIC).
+uint64_t MilliTime();
+
 // Returns the current time in nanoseconds (using the POSIX CLOCK_MONOTONIC).
 uint64_t NanoTime();