SyncManager: Dump per-source last sync time too.

Example:

Per Adapter History
     :
  mak...@gmail.com/com.google u0 [com.google.android.gms.people]
    Per source last syncs:
         OTHER  Success: 2018-04-16 17:03:38  Failure: 2018-04-16 17:04:27
         LOCAL  Success: N/A  Failure: N/A
          POLL  Success: N/A  Failure: N/A
          USER  Success: N/A  Failure: N/A
      PERIODIC  Success: N/A  Failure: N/A
          FEED  Success: N/A  Failure: N/A
    Last syncs:
      2018-04-16 17:04:27 io-error Source=OTHER Elapsed=0s Reason=AutoSync Extras=[]
      2018-04-16 17:03:38 success Source=OTHER Elapsed=5s Reason=AutoSync Extras=[]
      2018-04-16 17:03:20 success Source=OTHER Elapsed=3s Reason=AutoSync Extras=[]

Bug: 76035392
Change-Id: Id73cb10636897c4fe45caad5df13dca8b75381bd
Fixes: 76035392
Test: Manual test with dumpsys content with triggering various syncs
diff --git a/services/core/java/com/android/server/content/SyncManager.java b/services/core/java/com/android/server/content/SyncManager.java
index decae18..a55870f 100644
--- a/services/core/java/com/android/server/content/SyncManager.java
+++ b/services/core/java/com/android/server/content/SyncManager.java
@@ -1980,6 +1980,9 @@
     }
 
     static String formatTime(long time) {
+        if (time == 0) {
+            return "N/A";
+        }
         Time tobj = new Time();
         tobj.set(time);
         return tobj.format("%Y-%m-%d %H:%M:%S");
@@ -2334,13 +2337,28 @@
             pw.print("]");
             pw.println();
 
+            pw.println("    Per source last syncs:");
+            for (int j = 0; j < SyncStorageEngine.SOURCES.length; j++) {
+                pw.print("      ");
+                pw.print(String.format("%8s", SyncStorageEngine.SOURCES[j]));
+                pw.print("  Success: ");
+                pw.print(formatTime(event.second.perSourceLastSuccessTimes[j]));
+
+                pw.print("  Failure: ");
+                pw.println(formatTime(event.second.perSourceLastFailureTimes[j]));
+            }
+
+            pw.println("    Last syncs:");
             for (int j = 0; j < event.second.getEventCount(); j++) {
-                pw.print("    ");
+                pw.print("      ");
                 pw.print(formatTime(event.second.getEventTime(j)));
                 pw.print(' ');
                 pw.print(event.second.getEvent(j));
                 pw.println();
             }
+            if (event.second.getEventCount() == 0) {
+                pw.println("      N/A");
+            }
         }
     }
 
diff --git a/services/core/java/com/android/server/content/SyncStorageEngine.java b/services/core/java/com/android/server/content/SyncStorageEngine.java
index f54a9a0..6a343f8 100644
--- a/services/core/java/com/android/server/content/SyncStorageEngine.java
+++ b/services/core/java/com/android/server/content/SyncStorageEngine.java
@@ -128,8 +128,13 @@
 
     public static final long NOT_IN_BACKOFF_MODE = -1;
 
-    /** String names for the sync source types. */
-    public static final String[] SOURCES = { "OTHER",
+    /**
+     * String names for the sync source types.
+     *
+     * KEEP THIS AND {@link SyncStatusInfo#SOURCE_COUNT} IN SYNC.
+     */
+    public static final String[] SOURCES = {
+            "OTHER",
             "LOCAL",
             "POLL",
             "USER",
@@ -1231,12 +1236,7 @@
                 if (status.lastSuccessTime == 0 || status.lastFailureTime != 0) {
                     writeStatusNow = true;
                 }
-                status.lastSuccessTime = lastSyncTime;
-                status.lastSuccessSource = item.source;
-                status.lastFailureTime = 0;
-                status.lastFailureSource = -1;
-                status.lastFailureMesg = null;
-                status.initialFailureTime = 0;
+                status.setLastSuccess(item.source, lastSyncTime);
                 ds.successCount++;
                 ds.successTime += elapsedTime;
             } else if (!MESG_CANCELED.equals(resultMessage)) {
@@ -1246,12 +1246,8 @@
                 status.totalStats.numFailures++;
                 status.todayStats.numFailures++;
 
-                status.lastFailureTime = lastSyncTime;
-                status.lastFailureSource = item.source;
-                status.lastFailureMesg = resultMessage;
-                if (status.initialFailureTime == 0) {
-                    status.initialFailureTime = lastSyncTime;
-                }
+                status.setLastFailure(item.source, lastSyncTime, resultMessage);
+
                 ds.failureCount++;
                 ds.failureTime += elapsedTime;
             } else {