recovery: check battery level before installing package.

Bug: 26879394

Change-Id: I63dce5bc50c2e104129f1bcab7d3cad5682bf45d
diff --git a/install.h b/install.h
index 680499d..f92f061 100644
--- a/install.h
+++ b/install.h
@@ -23,7 +23,7 @@
 extern "C" {
 #endif
 
-enum { INSTALL_SUCCESS, INSTALL_ERROR, INSTALL_CORRUPT, INSTALL_NONE };
+enum { INSTALL_SUCCESS, INSTALL_ERROR, INSTALL_CORRUPT, INSTALL_NONE, INSTALL_SKIPPED };
 // Install the package specified by root_path.  If INSTALL_SUCCESS is
 // returned and *wipe_cache is true on exit, caller should wipe the
 // cache partition.