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* Get a display list dump. Build b2g with 'export B2G_DUMP_PAINTING=1' in your .userconfig(note: if you have a debug build, you don't need this). Set the preference 'user_pref("layout.display-list.dump", true);'.
* Look for the display list dump for the particularly process at the moment of interest. It will contains a list of display items and their mappings between layers and their original frames.
