Fix chrome build, add unit testing in Chrome

This patch contains preparation for running Open Screen unit tests in
Chrome, as well as successfully linking in the Chrome platform
implementation for Open Screen's platform target.

See the follow up patch here:
https://chromium-review.googlesource.com/c/chromium/src/+/1880544

Change-Id: I32c1bd728a43c5dbe155bcaa11527ad275c6b871
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/1887717
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>

1 files changed, 27 insertions, 6 deletions

diff --git a/BUILD.gn b/BUILD.gn
index b2f59afe..6667521f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -23,9 +23,7 @@ group("gn_all") {
     "third_party/abseil",
     "third_party/boringssl",
     "third_party/jsoncpp",
-    "third_party/protobuf:protoc",
     "third_party/tinycbor",
-    "third_party/zlib",
     "tools/cddl",
     "util",
   ]
@@ -45,17 +43,22 @@ group("gn_all") {
   if (use_chromium_quic && use_mdns_responder) {
     deps += [ "osp:osp_demo" ]
   }
+
+  if (!build_with_chromium) {
+    deps += [
+      "third_party/protobuf:protoc",
+      "third_party/zlib",
+    ]
+  }
 }
 
-executable("openscreen_unittests") {
+source_set("openscreen_unittests_all") {
   testonly = true
-  deps = [
+  public_deps = [
     "cast/common:unittests",
     "cast/sender:unittests",
     "discovery:unittests",
     "osp:unittests",
-    "osp/impl/discovery/mdns:unittests",
-    "osp/impl/testing:unittests",
     "osp/msgs:unittests",
     "platform:unittests",
     "streaming/cast:unittests",
@@ -63,4 +66,22 @@ executable("openscreen_unittests") {
     "third_party/googletest:gtest_main",
     "util:unittests",
   ]
+
+  if (use_mdns_responder) {
+    public_deps += [
+      "osp/impl/discovery/mdns:unittests",
+
+      # Currently this target only includes mDNS tests.
+      "osp/impl/testing:unittests",
+    ]
+  }
+}
+
+if (!build_with_chromium) {
+  executable("openscreen_unittests") {
+    testonly = true
+    deps = [
+      ":openscreen_unittests_all",
+    ]
+  }
 }