Update from https://crrev.com/327068

third_party/robolectric/BUILD.gn

+# Copyright 2015 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/rules.gni")
+
+# GYP: //third_party/robolectric/robolectric.gyp:android-all-4.3_r2-robolectric-0
+java_prebuilt("android-all-4.3_r2-robolectric-0") {
+  jar_path = "lib/android-all-4.3_r2-robolectric-0.jar"
+}
+
+# GYP: //third_party/robolectric/robolectric.gyp:tagsoup-1.2
+java_prebuilt("tagsoup-1.2") {
+  jar_path = "lib/tagsoup-1.2.jar"
+}
+
+# GYP: //third_party/robolectric/robolectric.gyp:json-20080701
+java_prebuilt("json-20080701") {
+  jar_path = "lib/json-20080701.jar"
+}
+
+# GYP: //third_party/robolectric/robolectric.gyp:robolectric_jar
+java_prebuilt("robolectric_java") {
+  testonly = true
+  jar_path = "lib/robolectric-2.4-jar-with-dependencies.jar"
+  deps = [
+    ":android-all-4.3_r2-robolectric-0",
+    ":tagsoup-1.2",
+    ":json-20080701",
+  ]
+}