Merge "Add build_id.mk" into androidx-master-dev
diff --git a/core/build_id.mk b/core/build_id.mk
new file mode 100644
index 0000000..3939eb2
--- /dev/null
+++ b/core/build_id.mk
@@ -0,0 +1,11 @@
+# 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.
+#
+# BUILD_ID is usually used to specify the branch name
+# (like "MAIN") or a branch name and a release candidate
+# (like "CRB01"). It must be a single word, and is
+# capitalized by convention.
+
+BUILD_ID=ANDROIDX
