[Android] Add option to add additional files to built jars.

build/config/android/internal_rules.gni

Index: build/config/android/internal_rules.gni
diff --git a/build/config/android/internal_rules.gni b/build/config/android/internal_rules.gni
index 88526416b446a22eff2d6f884ef3fec9206ba65d..db6790b3e3cc9ce3f28f486a3f08cdbadb373cd1 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -1520,7 +1520,7 @@ template("compile_java") {
   _enable_interface_jars_javac = true
   if (defined(invoker.processors_javac)) {
     _processors = invoker.processors_javac
-    _enable_iterface_jars_javac = _processors == []
+    _enable_interface_jars_javac = _processors == []
   }
 
   _processor_args = []
@@ -1528,6 +1528,11 @@ template("compile_java") {
     _processor_args = invoker.processor_args_javac
   }
 
+  _additional_jar_files = []
+  if (defined(invoker.additional_jar_files)) {
+    _additional_jar_files = invoker.additional_jar_files
+  }
+
   if (defined(invoker.enable_incremental_javac_override)) {
     # Use invoker-specified override.
     _enable_incremental_javac = invoker.enable_incremental_javac_override
@@ -1642,6 +1647,9 @@ template("compile_java") {
     foreach(e, _processor_args) {
       args += [ "--processor-arg=" + e ]
     }
+    foreach(e, _additional_jar_files) {
+      args += [ "--additional-jar-file=" + e ]
+    }
     args += rebase_path(_java_files, root_build_dir)
   }
 
@@ -1812,6 +1820,7 @@ template("java_library_impl") {
   compile_java(_compile_java_target) {
     forward_variables_from(invoker,
                            [
+                             "additional_jar_files",
                              "alternative_android_sdk_ijar",
                              "alternative_android_sdk_ijar_dep",
                              "dist_jar_path",