New firewall chain for default background restrictions

A new firewall chain is needed to configure background network
restrictions for apps.
This change only adds the API stubs and traffic controller constants to
make the chain work. Policy changes using this chain will follow in
the framework code.

Test: atest CtsNetTestCases:ConnectivityManagerTest
Test: atest ConnectivityServiceTest

NO_IFTTT=The Lint rule along with the relevant code in Common.h is
being deleted in aosp/2819759

Bug: 304347838
Change-Id: I33e2db6671431f7c576fc931d9f96e684fc1e78a
diff --git a/common/flags.aconfig b/common/flags.aconfig
index 0c46b48..b85c2fe 100644
--- a/common/flags.aconfig
+++ b/common/flags.aconfig
@@ -34,3 +34,10 @@
   description: "This flag controls whether isUidNetworkingBlocked is supported"
   bug: "297836825"
 }
+
+flag {
+  name: "basic_background_restrictions_enabled"
+  namespace: "android_core_networking"
+  description: "Block network access for apps in a low importance background state"
+  bug: "304347838"
+}