Expose ability to download network service impl in SDK.

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.
 
 import("//build/config/ui.gni")
+import("//build/module_args/mojo.gni")
 import("//mojo/public/mojo.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 # We don't support building in the component build since mojo apps are
 # inherently components.
 assert(!is_component_build)
 
 group("shell") {
   testonly = true
@@ skipping 283 matching lines @@
   mojo_shell_test_assets_dir = "$root_build_dir/mojo_shell_test_assets"
 
   copy_ex("copy_mojo_shell_assets") {
     clear_dir = true
     dest = mojo_shell_assets_dir
     sources = [
       "$root_out_dir/lib.stripped/libbootstrap.so",
       "$root_out_dir/network_service.mojo",
       "$root_out_dir/obj/shell/bootstrap_java.dex.jar",
     ]
+    if (use_prebuilt_network_service) {

[ppi, 2015/02/10 16:49:50]

Is this needed? I'd think that putting "$root_out_dir/network_service.mojo" in
sources would add the dependency. Or is it better to declare it explicitly?

[jamesr, 2015/02/10 22:45:21]

This shouldn't be conditional other than as a transition state.  Building the
shell implies being in the mojo which implies that the network service always
must be prebuilt.  I also agree that this target should just declare a
dependency on $r_o_t/n_s.mojo and let the build system figure out how that file
gets there

[blundell, 2015/02/11 21:06:17]

Done.

+      deps = [
+        "//mojo/public/tools:copy_network_service",
+      ]
+    }
   }
 
   copy("copy_mojo_shell") {
     sources = [
       "$root_out_dir/exe.stripped/mojo_shell",
     ]
     outputs = [
       "$root_out_dir/lib.stripped/libmojo_shell.so",
     ]
   }
@@ skipping 179 matching lines @@
 
     deps -= [
       ":lib",
       ":external_application_registrar_connection",
       ":external_application_registrar_bindings",
       "//shell/domain_socket",
       "//shell/domain_socket:tests",
     ]
   }
 }