How to use android library with native library as dependency for Chromium?

I'm working on integrating some library (aar that contains native library (.so)) into Chromium (Snapdragon-optimized fork to be more detailed).

In order to use it in Android code i had to modify chrome/android/BUILD.gn and add 2 dependencies:

deps = [
  ...
  "//third_party/libxyz_android:libxyz_android",
  "//third_party/libxyz_android:libxyz_android_settings",
  ...
]

So i had to create third_party/libxyz directory, put aar files there and create BUILD.gn:

import("//build/config/android/rules.gni")

android_aar_prebuilt("libxyz_android") {
  aar_path = "libxyz-android-release.aar"
#  proguard_configs = [ "src/proguard-gvr.txt" ]
  ignore_manifest = true  # Ignored because manifest merging is not supported (http://crbug.com/643967)
  ignore_native_libraries = false
}

android_aar_prebuilt("libxyz_android_settings") {
  aar_path = "libxyz-android-settings-release.aar"
  ignore_manifest = true  # Ignored because manifest merging is not supported (http://crbug.com/643967)
}

Note ignore_native_libraries = false as libxyz has native libaries.

While building of Chromium i got error:

android_aar_prebuilt() with .so files is not supported. Use ignore_native_libraries = true to silence this error.

It comes from here: https://chromium.googlesource.com/chromium/src/build/config/+/master/android/rules.gni#2817

assert(_ignore_native_libraries || !_scanned_files.has_native_libraries, ...

Is there any possibility to use aar with native libraries, some workaround or modified rules.gni? If i have to add the support myself - should i edit rules.gni and add native libraries copying from unzipped aar to target directory (it seems to be pretty simple)?

Update 1: i had to change target names and replace "-" to "_" because of target name error ("-" is not supported).

Solution

You need to modify android_aar_prebuilt in //build/config/android/rules.gni to copy the appropriate .so files into the build directory (root_build_dir).

Then you need to add a dependency on the AAR target to your android_apk target directly. Finally, also add the .so files in your build directory to the loadable_modules directive of android_apk (this is critical).

The GN Reference is your friend.