cronet: Add Android.extras.bp

This can be used to include cronet modules that doesn't require direct gn2bp translations as
it wont be overwritten.

Test: TH
Change-Id: Ic873662410034e4447f43202974480ceaa2c9636
diff --git a/Android.bp b/Android.bp
index 9599aac..b5912d9 100644
--- a/Android.bp
+++ b/Android.bp
@@ -14,6 +14,8 @@
 //
 // This file is automatically generated by gen_android_bp. Do not edit.
 
+build = ["Android.extras.bp"]
+
 // GN: PACKAGE
 package {
     default_applicable_licenses: [
diff --git a/Android.extras.bp b/Android.extras.bp
new file mode 100644
index 0000000..91bcbd8
--- /dev/null
+++ b/Android.extras.bp
@@ -0,0 +1,15 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This is manually maintained and automatically included into the Android.bp by the gn2bp script.
\ No newline at end of file