Increase activity exit-info timestamp resolution

Need finer grained timestamp when looking at process exit information

Test: adb shell dumpsys activity exit-info

Bug: 150324813
Change-Id: Ia7b2521694cb874096cebbe1bcfe7c62864d2369

services/core/java/com/android/server/am/AppExitInfoTracker.java

@@ -708,7 +708,7 @@ public final class AppExitInfoTracker {
 
     void dumpHistoryProcessExitInfo(PrintWriter pw, String packageName) {
         pw.println("ACTIVITY MANAGER LRU PROCESSES (dumpsys activity exit-info)");
-        SimpleDateFormat sdf = new SimpleDateFormat();
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
         synchronized (mLock) {
             pw.println("Last Timestamp of Persistence Into Persistent Storage: "
                     + sdf.format(new Date(mLastAppExitInfoPersistTimestamp)));