Add listServices/isDeclared/getDeclaredInstances for Accessors

We associate specific accessors with instance names, so we can get
more information about what is available through the existing service
manager APIs.

Test: atest binderRpcTest
Bug: 358427181
Change-Id: I337430a222b537643351bfc70178ccd1dc06d73b
diff --git a/libs/binder/BackendUnifiedServiceManager.h b/libs/binder/BackendUnifiedServiceManager.h
index 6a0d06a..2496f62 100644
--- a/libs/binder/BackendUnifiedServiceManager.h
+++ b/libs/binder/BackendUnifiedServiceManager.h
@@ -167,5 +167,9 @@
 sp<BackendUnifiedServiceManager> getBackendUnifiedServiceManager();
 
 android::binder::Status getInjectedAccessor(const std::string& name, android::os::Service* service);
+void appendInjectedAccessorServices(std::vector<std::string>* list);
+// Do not call any other service manager APIs that might take the accessor
+// mutex because this will be holding it!
+void forEachInjectedAccessorService(const std::function<void(const std::string&)>& f);
 
 } // namespace android