backuptool: Map extra dynamic partitions for Addon.d V3

Change-Id: Ia8fa1963c722c5aa2987b947e4e919e19909a9a8

tools/releasetools/edify_generator.py

@@ -157,14 +157,18 @@ class EdifyGenerator(object):
     self.script.append(self.WordWrap(cmd))
 
   def RunBackup(self, command, mount_point, dynamic=False):
-    if self.fstab:
-      p = self.fstab[mount_point]
+    systemEntry = self.fstab[mount_point]
     if dynamic:
+      for p in ["vendor", "product", "system_ext"]:
+        fstabEntry = self.fstab.get("/"+p, None)
+        if fstabEntry:
+          self.script.append('map_partition("%s");' % (fstabEntry.device,))
+
       self.script.append(('run_program("/tmp/install/bin/backuptool.sh", "%s", map_partition("%s"), "%s");' % (
-          command, p.device, p.fs_type)))
+          command, systemEntry.device, systemEntry.fs_type)))
     else:
       self.script.append(('run_program("/tmp/install/bin/backuptool.sh", "%s", "%s", "%s");' % (
-          command, p.device, p.fs_type)))
+          command, systemEntry.device, systemEntry.fs_type)))
 
   def ShowProgress(self, frac, dur):
     """Update the progress bar, advancing it over 'frac' over the next