Preopt: Do not strip non-image boot class path jars.

Test: Pixel 2 XL boots.
Bug: 119868597
Change-Id: I7bd3b7655aecf1a8c26dd8d4d18d3eec685ece88
diff --git a/android/variable.go b/android/variable.go
index 7e976cd..ddaf166 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -198,6 +198,9 @@
 	UncompressPrivAppDex             *bool    `json:",omitempty"`
 	ModulesLoadedByPrivilegedModules []string `json:",omitempty"`
 
+	BootJars       []string `json:",omitempty"`
+	PreoptBootJars []string `json:",omitempty"`
+
 	DisableDexPreopt        *bool    `json:",omitempty"`
 	DisableDexPreoptModules []string `json:",omitempty"`
 	DexPreoptProfileDir     *string  `json:",omitempty"`