Refine optimize page log pattern

- Add timestamp and prefix string
 - Chagne Action.MANUAL to LEAVE for better readability
 screenshot: https://screenshot.googleplex.com/ALTvMaPWVEq8y7c.png

Bug: 192523697
Test: make SettingsRoboTests
Change-Id: I69d1beceb98444d823f6ffc3a015cf61a7d7a66d

src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java

@@ -291,7 +291,7 @@ public class AdvancedPowerUsageDetail extends DashboardFragment implements
 
         BatteryHistoricalLogUtil.writeLog(
                 getContext().getApplicationContext(),
-                Action.MANUAL,
+                Action.LEAVE,
                 BatteryHistoricalLogUtil.getPackageNameWithUserId(
                         mBatteryOptimizeUtils.getPackageName(), UserHandle.myUserId()),
                 mLogStringBuilder.toString());

src/com/android/settings/fuelgauge/BatteryHistoricalLogUtil.java

@@ -21,6 +21,7 @@ import android.content.SharedPreferences;
 import android.util.Base64;
 
 import com.android.settings.fuelgauge.BatteryOptimizeHistoricalLogEntry.Action;
+import com.android.settings.fuelgauge.batteryusage.ConvertUtils;
 
 import com.google.common.annotations.VisibleForTesting;
 
@@ -49,6 +50,7 @@ public final class BatteryHistoricalLogUtil {
                         .setPackageName(pkg)
                         .setAction(action)
                         .setActionDescription(actionDescription)
+                        .setTimestamp(System.currentTimeMillis())
                         .build());
     }
 
@@ -89,6 +91,7 @@ public final class BatteryHistoricalLogUtil {
         if (logEntryList.isEmpty()) {
             writer.println("\tNo past logs.");
         } else {
+            writer.println("0:RESTRICTED  1:UNRESTRICTED  2:OPTIMIZED  3:UNKNOWN");
             logEntryList.forEach(entry -> writer.println(toString(entry)));
         }
     }
@@ -101,8 +104,9 @@ public final class BatteryHistoricalLogUtil {
     }
 
     private static String toString(BatteryOptimizeHistoricalLogEntry entry) {
-        return String.format("%s\tAction:%s\tEvent:%s",
-                entry.getPackageName(), entry.getAction(), entry.getActionDescription());
+        return String.format("%s\tAction:%s\tEvent:%s\tTimestamp:%s", entry.getPackageName(),
+                entry.getAction(), entry.getActionDescription(),
+                ConvertUtils.utcToLocalTimeForLogging(entry.getTimestamp()));
     }
 
     @VisibleForTesting