Merge changes If7d41052,I66f263d7,Id45ae956,Iba752fed,I575a7e4f, ... into qt-r1-dev

* changes:
  Inline readNetworkStatsDetailInternal, make mUseBpfStats final
  Remove VPN info arrays from NetworkStats(Observer|Recorder)
  NetworkStatsFactory: Take VPNs into account for network/battery stats
  Remove duplicate line in clat_simple test file
  Remove unused lastStats parameter
  Revert "Revert "Take all VPN underlying networks into account when migrating traffic for""
diff --git a/core/java/android/net/SocketKeepalive.java b/core/java/android/net/SocketKeepalive.java
index 46eddde..ec73866 100644
--- a/core/java/android/net/SocketKeepalive.java
+++ b/core/java/android/net/SocketKeepalive.java
@@ -44,9 +44,11 @@
  * {@link SocketKeepalive.Callback#onStopped} if the operation was successful or
  * {@link SocketKeepalive.Callback#onError} if an error occurred.
  *
- * The device SHOULD support keepalive offload. If it does not, it MUST reply with
+ * For cellular, the device MUST support at least 1 keepalive slot.
+ *
+ * For WiFi, the device SHOULD support keepalive offload. If it does not, it MUST reply with
  * {@link SocketKeepalive.Callback#onError} with {@code ERROR_UNSUPPORTED} to any keepalive offload
- * request. If it does, it MUST support at least 3 concurrent keepalive slots per transport.
+ * request. If it does, it MUST support at least 3 concurrent keepalive slots.
  */
 public abstract class SocketKeepalive implements AutoCloseable {
     static final String TAG = "SocketKeepalive";
diff --git a/core/java/android/net/util/KeepaliveUtils.java b/core/java/android/net/util/KeepaliveUtils.java
index 569fed1..bfc4563 100644
--- a/core/java/android/net/util/KeepaliveUtils.java
+++ b/core/java/android/net/util/KeepaliveUtils.java
@@ -34,9 +34,6 @@
 
     public static final String TAG = "KeepaliveUtils";
 
-    // Minimum supported keepalive count per transport if the network supports keepalive.
-    public static final int MIN_SUPPORTED_KEEPALIVE_COUNT = 3;
-
     public static class KeepaliveDeviceConfigurationException extends AndroidRuntimeException {
         public KeepaliveDeviceConfigurationException(final String msg) {
             super(msg);
@@ -84,10 +81,7 @@
                 throw new KeepaliveDeviceConfigurationException("Invalid transport " + transport);
             }
 
-            // Customized values should be either 0 to indicate the network doesn't support
-            // keepalive offload, or a positive value that is at least
-            // MIN_SUPPORTED_KEEPALIVE_COUNT if supported.
-            if (supported != 0 && supported < MIN_SUPPORTED_KEEPALIVE_COUNT) {
+            if (supported < 0) {
                 throw new KeepaliveDeviceConfigurationException(
                         "Invalid supported count " + supported + " for "
                                 + NetworkCapabilities.transportNameOf(transport));
diff --git a/services/core/java/com/android/server/connectivity/KeepaliveTracker.java b/services/core/java/com/android/server/connectivity/KeepaliveTracker.java
index 4b2e21d..cb64245 100644
--- a/services/core/java/com/android/server/connectivity/KeepaliveTracker.java
+++ b/services/core/java/com/android/server/connectivity/KeepaliveTracker.java
@@ -564,7 +564,7 @@
         if (KeepaliveInfo.STARTING == ki.mStartedState) {
             if (SUCCESS == reason) {
                 // Keepalive successfully started.
-                if (DBG) Log.d(TAG, "Started keepalive " + slot + " on " + nai.name());
+                Log.d(TAG, "Started keepalive " + slot + " on " + nai.name());
                 ki.mStartedState = KeepaliveInfo.STARTED;
                 try {
                     ki.mCallback.onStarted(slot);
diff --git a/tests/net/java/android/net/util/KeepaliveUtilsTest.kt b/tests/net/java/android/net/util/KeepaliveUtilsTest.kt
index 814e06e..8ea226d 100644
--- a/tests/net/java/android/net/util/KeepaliveUtilsTest.kt
+++ b/tests/net/java/android/net/util/KeepaliveUtilsTest.kt
@@ -78,7 +78,6 @@
         assertRunWithException(arrayOf("5"))
 
         // Check resource with invalid slots value.
-        assertRunWithException(arrayOf("2,2"))
         assertRunWithException(arrayOf("3,-1"))
 
         // Check resource with invalid transport type.