More knobs for connectivity experiments.

Keep the same default values in place for calculating opportunistic
quotas, but now allow experiments to override these values.

Tests to verify behavior of defaults.

Bug: 72353440
Test: atest com.android.server.NetworkPolicyManagerServiceTest
Change-Id: I38c225fd141b2e94085ca4cce17ecd51fee3f3aa
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 002c9e2..722d119 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -300,6 +300,12 @@
                     Settings.Global.NETSTATS_UID_TAG_DELETE_AGE,
                     Settings.Global.NETSTATS_UID_TAG_PERSIST_BYTES,
                     Settings.Global.NETSTATS_UID_TAG_ROTATE_AGE,
+                    Settings.Global.NETPOLICY_QUOTA_ENABLED,
+                    Settings.Global.NETPOLICY_QUOTA_UNLIMITED,
+                    Settings.Global.NETPOLICY_QUOTA_LIMITED,
+                    Settings.Global.NETPOLICY_QUOTA_FRAC_JOBS,
+                    Settings.Global.NETPOLICY_QUOTA_FRAC_MULTIPATH,
+                    Settings.Global.NETPOLICY_OVERRIDE_ENABLED,
                     Settings.Global.NETWORK_AVOID_BAD_WIFI,
                     Settings.Global.NETWORK_DEFAULT_DAILY_MULTIPATH_QUOTA_BYTES,
                     Settings.Global.NETWORK_METERED_MULTIPATH_PREFERENCE,