Add GN build for some chrome common, chrome net, and resources targets.

chrome/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/features.gni")
+
+# GYP version: chrome/chrome_resources.gyp:chrome_resources
+group("resources") {
+  deps = [
+    # Note: GYP lists some dependencies in addition to these actions. However,
+    # these are just dependencies for the actions themselves, which our actions
+    # list individually when needed.
+    "//chrome/browser:resources",
+    "//chrome/common:resources",
+    "//chrome/renderer:resources",
+  ]
+
+  if (enable_extensions) {
+    deps += [ "//chrome/common:extensions_api_resources" ]
+  }
+}