WebApkInstaller.java

@CalledByNative
private void installWebApkAsync(final String packageName, int version, final String title,
            String token, final int source, final Bitmap icon) {
  // Check whether the WebAPK package is already installed. The WebAPK may have been installed
  // by another Chrome version (e.g. Chrome Dev). We have to do this check because the Play
  // install API fails silently if the package is already installed.
    if (isWebApkInstalled(packageName)) {
        notify(WebApkInstallResult.SUCCESS);
        return;
    }

    // redacted 
    mInstallDelegate.installAsync(packageName, version, title, token, callback);
    
    // redacted
}