Add additional_jar_files to inputs for java_library targets.

build/config/android/rules.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/dcheck_always_on.gni")
 import("//build/toolchain/toolchain.gni")
 
 assert(is_android)
@@ skipping 1161 matching lines @@
   #     be used to remove unwanted parts of the library.
   #   proguard_config: Path to the proguard config for preprocessing.
   #
   #   supports_android: If true, Android targets (android_library, android_apk)
   #     may depend on this target. Note: if true, this target must only use the
   #     subset of Java available on Android.
   #   bypass_platform_checks: Disables checks about cross-platform (Java/Android)
   #     dependencies for this target. This will allow depending on an
   #     android_library target, for example.
   #
+  #   additional_jar_files: Use to package additional files into the output jar.
+  #     Pass a list of length-2 lists with format
+  #     [ [ path_to_file, path_to_put_in_jar ] ]
+  #
+  #
   #   data_deps, testonly
   #
   # Example
   #   java_library("foo_java") {
   #     java_files = [
   #       "org/chromium/foo/Foo.java",
   #       "org/chromium/foo/FooInterface.java",
   #       "org/chromium/foo/FooService.java",
   #     ]
   #     deps = [
@@ skipping 1513 matching lines @@
         supports_android = true
         jar_path = "${_output_path}/$jar"
       }
     }
 
     java_group(target_name) {
       deps = _resource_targets + _jar_targets
     }
   }
 }