Changed ActionLogger class to use nano timestamps. This is because fps instrument collects data in ns as well so is possible to match the two

wlauto/external/uiauto/src/com/arm/wlauto/uiauto/BaseUiAutomation.java

@@ -89,13 +89,13 @@ public class BaseUiAutomation extends UiAutomatorTestCase {
 
         public void start() {
             if (enabled) {
-                Log.d("UX_PERF", testTag + "_start " + System.currentTimeMillis());
+                Log.d("UX_PERF", testTag + "_start " + System.nanoTime());
             }
         }
 
         public void stop() throws Exception {
             if (enabled) {
-                Log.d("UX_PERF", testTag + "_end " + System.currentTimeMillis());
+                Log.d("UX_PERF", testTag + "_end " + System.nanoTime());
             }
         }
     }

wlauto/utils/uxperf.py

@@ -94,7 +94,7 @@ class UxPerfParser(object):
         for action, timestamps in self.actions.iteritems():
             # nanosecond precision, but not necessarily nanosecond resolution
             # truncate to guarantee millisecond precision
-            ts_ms = tuple(int(ts) for ts in timestamps)
+            ts_ms = tuple(int(int(ts) / 1e6) for ts in timestamps)
             if len(ts_ms) == 2:
                 start, finish = ts_ms
                 duration = finish - start