Add some remoting targets to GN build.

components/renderer_context_menu/BUILD.gn

+# Copyright 2014 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("//build/config/ui.gni")
+
+static_library("renderer_context_menu") {
+  sources = [
+    "context_menu_content_type.cc",
+    "context_menu_content_type.h",
+    "context_menu_delegate.cc",
+    "context_menu_delegate.h",
+    "render_view_context_menu_base.cc",
+    "render_view_context_menu_base.h",
+    "render_view_context_menu_observer.cc",
+    "render_view_context_menu_observer.h",
+    "render_view_context_menu_proxy.h",
+  ]
+
+  if (toolkit_views) {
+    sources += [
+      "views/toolkit_delegate_views.cc",
+      "views/toolkit_delegate_views.h",
+    ]
+  }
+
+  deps = [
+    "//base",
+    "//content/public/browser",
+    "//components/search_engines",
+    "//components/metrics/proto",
+  ]
+}