[Chromecast] Hook up mojo media pipeline.

chromecast/media/BUILD.gn

Index: chromecast/media/BUILD.gn
diff --git a/chromecast/media/BUILD.gn b/chromecast/media/BUILD.gn
index 832ea6430951166c9d039ae655d392c5a4c5cebb..d57639434924790ed0d7ee97ed053341a5e39e84 100644
--- a/chromecast/media/BUILD.gn
+++ b/chromecast/media/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//chromecast/chromecast.gni")
+import("//media/media_options.gni")
 import("//testing/test.gni")
 
 group("media") {
@@ -12,6 +13,10 @@ group("media") {
     "//chromecast/media/cdm",
     "//chromecast/media/cma",
   ]
+
+  if (enable_mojo_media == "browser") {
+    public_deps += [ "//chromecast/media/mojo" ]
+  }
 }
 
 test("cast_media_unittests") {