Merge changes from topic "native_bridge_for_app_zygote" am: 5f30976b am: 20d518fd

  DropCapabilitiesBoundingSet(fail_fn);

  bool use_native_bridge = !is_system_server &&

  bool need_pre_initialize_native_bridge =

      !is_system_server &&

      instruction_set.has_value() &&

      android::NativeBridgeAvailable() &&

      // Native bridge may be already initialized if this

      // is an app forked from app-zygote.

      !android::NativeBridgeInitialized() &&

      android::NeedsNativeBridge(instruction_set.value().c_str());

  if (use_native_bridge && !app_data_dir.has_value()) {

    // The app_data_dir variable should never be empty if we need to use a

    // native bridge.  In general, app_data_dir will never be empty for normal

    // applications.  It can only happen in special cases (for isolated

    // processes which are not associated with any app).  These are launched by

    // the framework and should not be emulated anyway.

    use_native_bridge = false;

    ALOGW("Native bridge will not be used because managed_app_data_dir == nullptr.");

  }

  MountEmulatedStorage(uid, mount_external, use_native_bridge, fail_fn);

  MountEmulatedStorage(uid, mount_external, need_pre_initialize_native_bridge, fail_fn);

  // If this zygote isn't root, it won't be able to create a process group,

  // since the directory is owned by root.

  SetGids(env, gids, fail_fn);

  SetRLimits(env, rlimits, fail_fn);

  if (use_native_bridge) {

    // Due to the logic behind use_native_bridge we know that both app_data_dir

    // and instruction_set contain values.

    android::PreInitializeNativeBridge(app_data_dir.value().c_str(),

  if (need_pre_initialize_native_bridge) {

    // Due to the logic behind need_pre_initialize_native_bridge we know that

    // instruction_set contains a value.

    android::PreInitializeNativeBridge(

        app_data_dir.has_value() ? app_data_dir.value().c_str() : nullptr,

        instruction_set.value().c_str());

  }