Build public cast_shell on x86 with GN.

chromecast/renderer/BUILD.gn

Index: chromecast/renderer/BUILD.gn
diff --git a/chromecast/renderer/BUILD.gn b/chromecast/renderer/BUILD.gn
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+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//chromecast/chromecast.gni")
+
+source_set("renderer") {
+  sources = [
+    "cast_content_renderer_client.cc",
+    "cast_content_renderer_client.h",
+    "cast_media_load_deferrer.cc",
+    "cast_media_load_deferrer.h",
+    "cast_render_process_observer.cc",
+    "cast_render_process_observer.h",
+    "key_systems_cast.cc",
+    "key_systems_cast.h",
+
+    # TODO(slan): Can these be added into "//chromecast/renderer/media"?
+    "media/capabilities_message_filter.cc",
+    "media/capabilities_message_filter.h",
+  ]
+
+  if (chromecast_branding == "public") {
+    sources += [ "cast_content_renderer_client_simple.cc" ]
+  }
+
+  public_deps = [
+    "//chromecast/renderer/media",
+  ]
+
+  deps = [
+    "//base",
+    "//chromecast/base",
+    "//chromecast/crash",
+    "//chromecast/common/media",
+    "//chromecast/media",
+    "//components/cdm/renderer",
+    "//components/network_hints/renderer",
+    "//content/public/common",
+    "//content/public/renderer",
+    "//crypto",
+    "//ipc",
+    "//media",
+    "//third_party/widevine/cdm:version_h",
+  ]
+}