Prepare role code for modularization.

- PooledLambda: PoolLambda is replaced with plain lambdas, to avoid
adding ~20 classes to boot classpath (for each module that uses
lambda).

- SystemServiceRegistry: RoleFrameworkInitializer is added to add
ROLE_SERVICE, similar to other modules.

- RoleService: RoleManagerService is renamed to RoleService to better
reflect the manager/service relationship.

- @MainThread: import for Looper is removed because it's only used in
javadoc and triggers package not exist error during build. @linkplain
in the javadoc is also removed because it triggers an error in
Metalava parsing and isn't critical.

- Added small utilities: These utilities has their full version in
platform, but is too large and contains too many internal references
in methods unreferenced by role, whereas actually role only needs 1 or
2 methods from them. So just create a small copy of the used methods
for role modularization, and they will be moved into APEX with role.

Bug: 158736025
Test: manual
Change-Id: I74f20b37d23370e258e7fc7130e28c5312abf46c

services/java/com/android/server/SystemServer.java

@@ -168,7 +168,7 @@ import com.android.server.powerstats.PowerStatsService;
 import com.android.server.profcollect.ProfcollectForwardingService;
 import com.android.server.recoverysystem.RecoverySystemService;
 import com.android.server.restrictions.RestrictionsManagerService;
-import com.android.server.role.RoleManagerService;
+import com.android.server.role.RoleServicePlatformHelper;
 import com.android.server.security.FileIntegrityService;
 import com.android.server.security.KeyAttestationApplicationIdProviderService;
 import com.android.server.security.KeyChainSystemService;
@@ -353,6 +353,7 @@ public final class SystemServer implements Dumpable {
             "com.android.server.ConnectivityServiceInitializer";
     private static final String IP_CONNECTIVITY_METRICS_CLASS =
             "com.android.server.connectivity.IpConnectivityMetrics";
+    private static final String ROLE_SERVICE_CLASS = "com.android.server.role.RoleService";
 
     private static final String TETHERING_CONNECTOR_CLASS = "android.net.ITetheringConnector";
 
@@ -2032,8 +2033,9 @@ public final class SystemServer implements Dumpable {
 
             // Grants default permissions and defines roles
             t.traceBegin("StartRoleManagerService");
-            mSystemServiceManager.startService(new RoleManagerService(
-                    mSystemContext, new RoleServicePlatformHelperImpl(mSystemContext)));
+            LocalManagerRegistry.addManager(RoleServicePlatformHelper.class,
+                    new RoleServicePlatformHelperImpl(mSystemContext));
+            mSystemServiceManager.startService(ROLE_SERVICE_CLASS);
             t.traceEnd();
 
             // We need to always start this service, regardless of whether the