Ensure extracted JNIs are stored properly in APKs

If the android_app has the use_embedded_native_libs flag
all its JNIs must be stored with the store compression method.

The logic to add JNIs from ARR is as follows:
1) Extract JNI libs from AAR
2) Store JNI libs with deflate
3) Merge deflated JNI libs with APK

This process produces a bogus APK that won't be loaded by the
framework if the use_embedded_native_libs is set as the resulting
APK will have all its merged entries stored as deflate.

To solve the problem in case we merge JNIs with an app requiring
uncompressed JNI we add an extra step to ensure they're compressed
using the store method.

Test: m, verify apk using jni_extract has stored libs
Change-Id: Ic31d47f15412171b5898dd0e2a554cb6bf93293b

java/app_builder.go

@@ -268,12 +268,24 @@ func TransformJniLibsToJar(
 		Args:        args,
 	})
 	if len(prebuiltJniPackages) > 0 {
+		var mergeJniJarPath android.WritablePath = android.PathForModuleOut(ctx, "mergeJniJarOutput.zip")
+		if !uncompressJNI {
+			mergeJniJarPath = outputFile
+		}
 		ctx.Build(pctx, android.BuildParams{
 			Rule:        mergeAssetsRule,
 			Description: "merge prebuilt JNI packages",
 			Inputs:      append(prebuiltJniPackages, jniJarPath),
-			Output:      outputFile,
+			Output:      mergeJniJarPath,
 		})
+
+		if uncompressJNI {
+			ctx.Build(pctx, android.BuildParams{
+				Rule:   uncompressEmbeddedJniLibsRule,
+				Input:  mergeJniJarPath,
+				Output: outputFile,
+			})
+		}
 	}
 }