Install android_app_set modules in Soong

Add support for installing extra files from a zip file when installing
a primary file, and use it to support installing android_app_set modules,
which install a primary APK and then an unknown set of additional splits
APKs.

Test: app_set_test.go
Test: install test android_app_set
Bug: 204136549
Change-Id: Ia92f7e5c427adcef3bcf59c82a2f83450905c01d
diff --git a/java/app_set.go b/java/app_set.go
index 2e9a4ab..694b167 100644
--- a/java/app_set.go
+++ b/java/app_set.go
@@ -143,8 +143,18 @@
 				"zip":               as.packedOutput.String(),
 			},
 		})
+
+	var installDir android.InstallPath
+	if as.Privileged() {
+		installDir = android.PathForModuleInstall(ctx, "priv-app", as.BaseModuleName())
+	} else {
+		installDir = android.PathForModuleInstall(ctx, "app", as.BaseModuleName())
+	}
+	ctx.InstallFileWithExtraFilesZip(installDir, as.BaseModuleName()+".apk", as.primaryOutput, as.packedOutput)
 }
 
+func (as *AndroidAppSet) InstallBypassMake() bool { return true }
+
 // android_app_set extracts a set of APKs based on the target device
 // configuration and installs this set as "split APKs".
 // The extracted set always contains an APK whose name is