Export deps.bzl to ensure adhd and webrtc-apm deps.bzl is in sync

The files are introduced in CL:4675196 and CL:4675335.

BUG=b:264650897
TEST=None

Cq-Depend: chromium:4681360
Change-Id: I42fa17586e8e128e39e637db6daaef092cd55fc5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/webrtc-apm/+/4680543
Commit-Queue: Li-Yu Yu <aaronyu@google.com>
Tested-by: Li-Yu Yu <aaronyu@google.com>
Reviewed-by: Jeremy Wu <jrwu@google.com>
diff --git a/BUILD.bazel b/BUILD.bazel
index fd1dfda..c8e41f6 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -26,8 +26,8 @@
     linkopts = ["-lm"],
     deps = [
         ":webrtc_apm",
-        "@pkg_config//gtest",
         "@pkg_config//gmock",
+        "@pkg_config//gtest",
         "@pkg_config//gtest_main",
     ],
 )
@@ -66,3 +66,10 @@
     },
     visibility = ["//:__subpackages__"],
 )
+
+exports_files(
+    srcs = ["deps.bzl"],
+    visibility = [
+        "@adhd//:__subpackages__",  # To allow diff test to ensure it is in sync.
+    ],
+)