Fix a timestamp bug in window transition.

Bug: 143121185
Test: atest CtsWindowManagerDeviceTestCases:ActivityMetricsLoggerTests
Change-Id: I8eef29032afaaf01f41c46d88833c05a61ca5b76
diff --git a/services/core/java/com/android/server/wm/ActivityMetricsLogger.java b/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
index 9d41d97..1d8d732 100644
--- a/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
+++ b/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
@@ -478,13 +478,13 @@
     /**
      * Notifies the tracker that the starting window was drawn.
      */
-    void notifyStartingWindowDrawn(@WindowingMode int windowingMode, long timestamp) {
+    void notifyStartingWindowDrawn(@WindowingMode int windowingMode, long timestampNs) {
         final WindowingModeTransitionInfo info = mWindowingModeTransitionInfo.get(windowingMode);
         if (info == null || info.loggedStartingWindowDrawn) {
             return;
         }
         info.loggedStartingWindowDrawn = true;
-        info.startingWindowDelayMs = calculateDelay(timestamp);
+        info.startingWindowDelayMs = calculateDelay(timestampNs);
     }
 
     /**