Add third_party/android_data_chart for data chart widget.

third_party/android_data_chart/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")
+
+assert(is_android)
+
+android_resources("android_data_chart_java_resources") {
+  custom_package = "org.chromium.third_party.android"
+  resource_dirs = [ "java/res" ]
+}
+
+android_library("android_data_chart_java") {
+  DEPRECATED_java_in_dir = "java/src"
+  deps = [
+    ":android_data_chart_java_resources",
+  ]
+}