Include test license server in official builds

It appears that the test license server is not copied over when running
Widevine tests, so updating the target to copy over the folder
containing it if it's available.

Bug: 976083
Change-Id: I987beb4506b5cba7d3ed9a02edc5a91a5c327d6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947361
Commit-Queue: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Auto-Submit: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721593}

third_party/widevine/cdm/BUILD.gn

@@ -144,12 +144,10 @@ group("cdm") {
 
 # This target exists for tests to depend on that pulls in a runtime dependency
 # on the license server.
-source_set("widevine_test_license_server") {
-  if (is_chrome_branded && is_linux) {
-    deps = [
-      # TODO(jrummell)
-      # This target should be removed and targets should have data_deps on this target:
-      #"//third_party/widevine/test/license_server/license_server.gyp:test_license_server"
+group("widevine_test_license_server") {
+  if (bundle_widevine_cdm && is_linux) {
+    data = [
+      "//third_party/widevine/test/license_server/",
     ]
   }
 }