Add ijar to third_party and use it for generating .jar.toc files in GN

build/config/android/internal_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("//third_party/ijar/ijar.gni")
 
 assert(is_android)
 
 rebased_android_sdk = rebase_path(android_sdk, root_build_dir)
 rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
 rebased_android_sdk_build_tools =
     rebase_path(android_sdk_build_tools, root_build_dir)
 
 android_sdk_jar = "$android_sdk/android.jar"
 rebased_android_sdk_jar = rebase_path(android_sdk_jar, root_build_dir)
@@ skipping 453 matching lines @@
                              ])
       sources = [
         _input_jar_path,
       ]
       outputs = [
         _output_jar_path,
       ]
     }
   }
 
-  action("${target_name}__jar_toc") {
-    script = "//build/android/gyp/jar_toc.py"
-    depfile = "$target_gen_dir/$target_name.d"
-    outputs = [
-      depfile,
-      _jar_toc_path,
-      _jar_toc_path + ".md5.stamp",
-    ]
-    inputs = [
-      _output_jar_path,
-    ]
-    args = [
-      "--depfile",
-      rebase_path(depfile, root_build_dir),
-      "--jar-path",
-      rebase_path(_output_jar_path, root_build_dir),
-      "--toc-path",
-      rebase_path(_jar_toc_path, root_build_dir),
-    ]
-    public_deps = [
+  # TODO(agrieve): Change file extension to .ijar and use them in classpaths.
+  generate_interface_jar("${target_name}__jar_toc") {
+    input_jar = _output_jar_path
+    output_jar = _jar_toc_path
+    deps = [
       ":$_output_jar_target",
     ]
   }
 
   group(target_name) {
     forward_variables_from(invoker, [ "visibility" ])
     public_deps = [
       ":${target_name}__jar_toc",
       ":$_output_jar_target",
     ]
@@ skipping 1120 matching lines @@
     ]
     args = [
       "--depfile",
       rebase_path(depfile, root_build_dir),
       "--script-output-path",
       rebase_path(generated_script, root_build_dir),
     ]
     args += test_runner_args
   }
 }