Allow for overlaying dynamic shared libraries

Overlays targeting shared libraries should be loaded into the
resources of every target that depends on the shared library.

Static shared libraries are currently not supported because overlays
should override all versions of static shared libraries and there is
not currently support for an overlay targeting multiple APKs.

Also created a test instrumentation and host test suite for testing
overlays and packages on the system image.

Bug: 140790224
Test: atest OverlayRemountedTest
Change-Id: I20a217b6368d6cf92b2b9f46908fd58012933f72
diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 2c6be41..8cfd2d8 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -141,7 +141,10 @@
           // to take effect.
           const auto& loaded_idmap = apk_assets->GetLoadedIdmap();
           auto target_package_iter = apk_assets_package_ids.find(loaded_idmap->TargetApkPath());
-          if (target_package_iter != apk_assets_package_ids.end()) {
+          if (target_package_iter == apk_assets_package_ids.end()) {
+             LOG(INFO) << "failed to find target package for overlay "
+                       << loaded_idmap->OverlayApkPath();
+          } else {
             const uint8_t target_package_id = target_package_iter->second;
             const uint8_t target_idx = package_ids_[target_package_id];
             CHECK(target_idx != 0xff) << "overlay added to apk_assets_package_ids but does not"
@@ -591,7 +594,7 @@
       if (resource_resolution_logging_enabled_) {
         last_resolution_.steps.push_back(
             Resolution::Step{Resolution::Step::Type::OVERLAID, overlay_result.config.toString(),
-                             &package_group.packages_[0].loaded_package_->GetPackageName()});
+                             overlay_result.package_name});
       }
     }
   }