[chromecast] Add a chromecast/build:archive target.

This target packages output artifacts into a format that the
Cast internal build infrastructure expects.

Bug: Internal b/143701141
Test: build atv and udon with internal patch
Change-Id: I38bab1bdffbb2cb78ae503f554def458f296ab41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894831Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Simeon Anfinrud <sanfin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712185}

chromecast/BUILD.gn

@@ -25,7 +25,9 @@ declare_args() {
 # Depends on all non-test targets that should be built by the Chromecast
 # internal build infrastructure.
 group("all") {
-  deps = []
+  deps = [
+    "//chromecast/build:archive",
+  ]
   if (is_android && chromecast_branding == "public") {
     deps += [ ":cast_shell_apk" ]
   }

chromecast/build/BUILD.gn

+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//chromecast/chromecast.gni")
+
+if (is_android) {
+  artifact_type_suffix = "$cast_build_incremental-$target_cpu"
+
+  copy("archive_public_cast_apk") {
+    sources = [
+      "$root_out_dir/apks/CastShell.apk",
+    ]
+    outputs = [
+      "$root_out_dir/archive/CastShell-$artifact_type_suffix.apk",
+    ]
+    deps = [
+      "//chromecast:cast_shell_apk",
+    ]
+  }
+}
+
+group("archive") {
+  if (chromecast_branding == "internal") {
+    deps = [
+      "//chromecast/internal/build:archive",
+    ]
+  } else if (is_android) {
+    deps = [
+      ":archive_public_cast_apk",
+    ]
+  }
+}