Add src_files to src_jar GN template

url/BUILD.gn

 # Copyright (c) 2013 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/buildflag_header.gni")
 import("//testing/test.gni")
 import("features.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 81 matching lines @@
     sources += [
       "url_canon_icu.cc",
       "url_canon_icu.h",
     ]
     deps += [ "//third_party/icu" ]
   }
 }
 
 if (is_android) {
   android_library("url_java") {
-    java_files = [ "android/java/src/org/chromium/url/IDNStringUtil.java" ]
+    srcjar_deps = [ ":url_java_srcjar" ]
     deps = [
       "//base:base_java",
     ]
   }
 
+  # Creates srcjar that contains sources for "url_java".
+  zip("url_java_srcjar") {
+    inputs = [
+      "android/java/src/org/chromium/url/IDNStringUtil.java",
+    ]
+    output = "$target_gen_dir/$target_name.srcjar"
+    base_dir = rebase_path("//url")
+  }
+
   generate_jni("url_jni_headers") {
     sources = [
       "android/java/src/org/chromium/url/IDNStringUtil.java",
     ]
     jni_package = "url"
   }
 }
 
 test("url_unittests") {
   sources = [
@@ skipping 46 matching lines @@
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (!is_ios) {
     deps += [
       "//mojo/edk/system",
       "//mojo/edk/test:test_support",
       "//url/mojo:test_url_mojom_gurl",
     ]
   }
 }