Add filegroup for data-binding srcs

The filegroup will be used when we generate offline-sdk-docs in Soong.

Bug: b/70351683
Test: m -j offline-sdk-docs

Change-Id: I8142a0599a3583d3e0d738375484a688ccaef93d

Android.bp

diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..4c10b08
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 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.
+
+filegroup {
+    name: "frameworks-data-binding-srcs",
+    srcs: [
+        "baseLibrary/src/main/**/*.java",
+        "extensions/library/src/main/**/*.java",
+        "extensions/library/src/doc/**/*.java",
+    ],
+}