[Chromecast] Introduce internal renderer manifest overlay

Merge-With: eureka-internal/209868
Bug: internal b/117985053
Test: CQ
Change-Id: Id10498c6fea52563a8afefc37e6ddd48c1c1bd18
Reviewed-on: https://chromium-review.googlesource.com/c/1292109
Commit-Queue: Sean Topping <seantopping@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601788}

chromecast/browser/BUILD.gn

@@ -376,6 +376,10 @@ service_manifest("cast_content_browser_manifest_overlay") {
 # interfaces in "content_renderer".
 service_manifest("cast_content_renderer_manifest_overlay") {
   source = "cast_content_renderer_manifest_overlay.json"
+
+  if (chromecast_branding != "public") {
+    overlays = [ "//chromecast/internal/shell/browser:cast_content_renderer_internal_manifest_overlay" ]
+  }
 }
 
 # This target is for packaged services that will run in the main (browser)