Make it possible to share the embedder's dart sources for the vmservice

runtime/bin/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 
 declare_args() {
   dart_io_support = false
 }
 
 
 resources_sources_gypi =
     exec_script("../../tools/gypi_to_gn.py",
-                [rebase_path("resources_sources.gypi")],
+                [rebase_path("vmservice/vmservice_sources.gypi")],
                 "scope",
-                ["resources_sources.gypi"])
+                ["vmservice/vmservice_sources.gypi"])
 
 # Generate a resources.cc file for the service isolate without Observatory.
 action("gen_resources_cc") {
   visibility = [ ":*" ] # Only targets in this file can see this.
   script = "../tools/create_resources.py"
   inputs = [
     "../tools/create_resources.py",
   ]
-  sources = resources_sources_gypi.sources
+  sources = rebase_path(resources_sources_gypi.sources,
+                        "",
+                        "//dart/runtime/bin/vmservice/")

[zra, 2016/01/28 18:40:04]

Is there any way to avoid using a path here that is specific to the Mojo repo?

[Cutch, 2016/01/28 23:49:44]

Not that I'm aware of. Have any of these BUILD.gn files been exercised outside
of mojo or flutter repositories?

[zra, 2016/01/29 02:58:18]

No, but it would one day be nice to switch the Dart build from gyp to GN. Maybe
it's a bit of a pipe dream, though. Would you mind adding a note just in case?

[Cutch, 2016/01/29 15:36:52]

I've left a note. I would be really pleased if we switched to GN.

   outputs = [ "$target_gen_dir/resources_gen.cc" ]
   args = [
     "--output",
     rebase_path("$target_gen_dir/resources_gen.cc", root_build_dir),
     "--outer_namespace", "dart",
     "--inner_namespace", "bin",
     "--table_name", "service_bin",
     "--root_prefix", rebase_path(".", root_build_dir) + "/",
   ] + rebase_path(sources, root_build_dir)
 }
@@ skipping 288 matching lines @@
     "log_macos.cc",
     "log_win.cc",
     "log.h",
   ]
 
   include_dirs = [
     "..",
     "//third_party"
   ]
 }