Adds the old timezone to dumpsys logs after a timezone update.

This makes it easier to understand timezone change logs. This will also make it easier to automatically parse the timezone change logs, as all the relevant information about a timezone change is now included in the timezone change log line.

Flag: EXEMPT log only update
Bug: 290318043
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e6a38a556958a72e91bf432b441680996666a16d)
Merged-In: I18664e3465c0c6145a87010e9928e10167b15567
Change-Id: I18664e3465c0c6145a87010e9928e10167b15567

1 files changed, 3 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/SystemTimeZone.java b/services/core/java/com/android/server/SystemTimeZone.java
index dd07081bda12..c8810f672320 100644
--- a/services/core/java/com/android/server/SystemTimeZone.java
+++ b/services/core/java/com/android/server/SystemTimeZone.java
@@ -133,6 +133,7 @@ public final class SystemTimeZone {
         boolean timeZoneChanged = false;
         synchronized (SystemTimeZone.class) {
             String currentTimeZoneId = getTimeZoneId();
+            @TimeZoneConfidence int currentConfidence = getTimeZoneConfidence();
             if (currentTimeZoneId == null || !currentTimeZoneId.equals(timeZoneId)) {
                 SystemProperties.set(TIME_ZONE_SYSTEM_PROPERTY, timeZoneId);
                 if (DEBUG) {
@@ -145,6 +146,8 @@ public final class SystemTimeZone {
                 String logMsg = "Time zone or confidence set: "
                         + " (new) timeZoneId=" + timeZoneId
                         + ", (new) confidence=" + confidence
+                        + ", (old) timeZoneId=" + currentTimeZoneId
+                        + ", (old) confidence=" + currentConfidence
                         + ", logInfo=" + logInfo;
                 addDebugLogEntry(logMsg);
             }