Add some remoting targets to GN build.

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 45d2db6ba8bb50dd33130883c96a25bbbe8a9db7..1d7eb133465daeaaf3094460e91a13d586e3e75c 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -64,6 +64,7 @@ group("all_components") {
     "//components/pref_registry",
     "//components/query_parser",
     "//components/rappor",
+    "//components/renderer_context_menu",
     "//components/resources:components_resources",
     "//components/search",
     "//components/search_engines",
@@ -144,6 +145,7 @@ group("all_components") {
       "//components/precache/content",  # Blocked on content.
       "//components/precache/core",  # Should work, needs checking.
       "//components/rappor",  # Should work, needs checking.
+      "//components/renderer_context_menu",  # Blocked on content.
       "//components/search_engines",  # Should work, needs checking.
       "//components/search_provider_logos",  # Should work, needs checking.
       "//components/sessions",  # Blocked on content.