Land prep work to enable NaCl in the Linux x64 GN builds.

extensions/shell/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.
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
 import("//chrome/version.gni")
 import("//tools/grit/grit_rule.gni")
+import("//components/nacl/nacl_defines.gni")
 
 assert(enable_extensions)
 
 grit("resources") {
   source = "app_shell_resources.grd"
   outputs = [
     "grit/app_shell_resources.h",
     "app_shell_resources.pak",
   ]
 }
@@ skipping 111 matching lines @@
     "common/shell_extensions_client.h",
     "common/switches.cc",
     "common/switches.h",
     "renderer/shell_content_renderer_client.cc",
     "renderer/shell_content_renderer_client.h",
     "renderer/shell_extensions_renderer_client.cc",
     "renderer/shell_extensions_renderer_client.h",
     "utility/shell_content_utility_client.cc",
     "utility/shell_content_utility_client.h",
   ]
+
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//ui/chromeos:ui_chromeos",
       "//ui/display",
     ]
     sources += [
       "browser/api/shell_gcd/shell_gcd_api.cc",
       "browser/api/shell_gcd/shell_gcd_api.h",
       "browser/api/vpn_provider/vpn_service_factory.cc",
     ]
   }
+
+  if (enable_nacl) {
+    sources += [
+      "browser/shell_nacl_browser_delegate.cc",
+      "browser/shell_nacl_browser_delegate.h",
+    ]
+
+    defines = nacl_defines
+
+    deps += [
+      "//components/nacl",
+      "//components/nacl:nacl_browser",
+      "//components/nacl:nacl_common",
+      "//components/nacl:nacl_renderer",
+      "//components/nacl:nacl_switches",
+      "//components/nacl/renderer/plugin:nacl_trusted_plugin",
+    ]
+
+    if (is_linux) {
+      deps += [ "//components/nacl:nacl_helper" ]
+    }
+  }
 }
 
 if (!(is_chromeos && !use_ozone) && (!is_win || link_chrome_on_windows)) {
   executable("app_shell") {
     # testonly because :app_shell_lib is testonly. See :app_shell_lib comment.
     testonly = true
     sources = [
       "app/shell_main.cc",
     ]
     deps = [
       ":app_shell_lib",
       "//extensions:shell_and_test_pak",
     ]
 
     if (is_win) {
       configs += [ "//build/config/win:windowed" ]
       configs -= [ "//build/config/win:console" ]
     }
   }
 }
 
 process_version("version_header") {
   source = "common/version.h.in"
   output = "$target_gen_dir/common/version.h"
 }