Add .gitmodules file.

Bug: 1421776
Change-Id: I6890eda6f1c9b40c27343a359b1a5dd3027276c7
Reviewed-on: https://chromium-review.googlesource.com/c/android_tools/+/4312583
Reviewed-by: John Budorick <[email protected]>
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..793ce34
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "ndk"]
+	path = ndk
+	url = https://chromium.googlesource.com/android_ndk.git
diff --git a/ndk b/ndk
new file mode 160000
index 0000000..e951c37
--- /dev/null
+++ b/ndk
@@ -0,0 +1 @@
+Subproject commit e951c37287c7d8cd915bf8d4149fd4a06d808b55