Add new themed applications in an apk theme

Hi

I modified Kroz's Asul theme (OK) but now I'd like to add new themed apps like Chrome to start with an example.
I extract the apk file on my PC then I modify the .png and .9.png files.
I copy/paste the files in the right directories.

But now it seems that I have to create an .xml file in res/xml folder:
1/ How to know which name I have to use for the new .xml file?
2/ Which redirections I have to enter to apply the themed pictures?

Thanks in advance.

EDIT
Answers:
1/ How to know which name I have to use for the new .xml file? Check "package" in AndroidManifest.xml of themed app
2/ Which redirections I have to enter to apply the themed pictures? one line for each same file nam without extension. Example: one line for drawable folders and one other for mipmap folders.