Initial work on Dart bindings for Mojo.

mojo/dart/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.
+
+group("dart") {
+  deps = [
+    ":embedder",
+  ]
+}
+
+group("embedder") {
+  deps = [
+    ":mojo_dart_embedder",
+    ":copy_embedder",
+  ]
+}
+
+shared_library("mojo_dart_embedder") {
+  dart_flags = "//mojo/dart/tools/find_api_include_path.py"
+  include_dirs = exec_script(dart_flags, [], "list lines")
+  defines = ["DART_SHARED_LIB"]
+  sources = [
+    "system/mojo_dart_embedder.cc",
+  ]
+  deps = [
+    "//mojo/edk/system",
+  ]
+}
+
+copy("copy_embedder") {
+  sources = [
+    "$root_out_dir/libmojo_dart_embedder.so",
+  ]
+  outputs = [
+    "$root_out_dir/gen/mojo/public/dart/system/lib/src/libmojo_dart_embedder.so"
+  ]
+  deps =[
+    ":mojo_dart_embedder"
+  ]
+}