Chime DFM: Select the downstream DFM hook if possible.

The actual Chime implementation glue code lives in downstream. The
public Chrome apk or app bundle only builds an empty one. We use
enable_chrome_android_internal to select the correct build target.

Bug: 1013386
Change-Id: Iddde5fa2c466724c94bee504abc72b0facd39b1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872721Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Hesen Zhang <hesen@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708468}

chrome/android/modules/chime/chime_module.gni

@@ -2,15 +2,22 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/android/config.gni")
+
 declare_args() {
+  # Whether to integrate Chime notification SDK into Chrome.
   use_chime_android_sdk = false
 }
 
-# TODO(xingliu): Use enable_chrome_android_internal to select the downstream impl.
 chime_module_desc = {
   name = "chime"
   android_manifest =
       "//chrome/android/modules/chime/internal/java/AndroidManifest.xml"
 
-  java_deps = [ "//chrome/android/modules/chime/internal:java" ]
+  # The actual SDK lives in a DFM in downstream.
+  if (enable_chrome_android_internal) {
+    java_deps = [ "//clank/features/chime:chime_dfm_java" ]
+  } else {
+    java_deps = [ "//chrome/android/modules/chime/internal:java" ]
+  }
 }