Starting work on full GN build

runtime/observatory/BUILD.gn

 # Copyright 2015 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.
 
 # Currently paths here are hard coded for convenience in building Mojo/Flutter.
 declare_args() {
   # Specify the path to a host compatible version of the Dart SDK.
   # This SDK is used to compile the Observatory frontend sources.
   dart_host_sdk = rebase_path("//third_party/dart-sdk/dart-sdk")
 
@@ skipping 23 matching lines @@
   deps = [
     ":copy_observatory",
   ]
 
   script = "../../tools/observatory_tool.py"
 
   inputs = [
     rebase_path("pubspec.yaml"),
   ]
 
+  current_dir = rebase_path(".", "//")
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--directory",
-    rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/"),
+    rebase_path("$root_gen_dir/observatory_copy/$current_dir/"),
     "--command",
     "rewrite",
     rebase_path("../observatory/pubspec.yaml"),
     rebase_path(
-        "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml"),
+        "$root_gen_dir/observatory_copy/$current_dir/pubspec.yaml"),
     "../../third_party/",
     rebase_path("../../third_party/"),
   ]
 
   outputs = [
-    "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml",
+    "$root_gen_dir/observatory_copy/$current_dir/pubspec.yaml",
   ]
 }
 
 action("copy_observatory_deps") {
   deps = [
     ":write_observatory_pubspec_yaml",
   ]
 
   script = "../../tools/observatory_tool.py"
 
+  current_dir = rebase_path(".", "//")
   inputs = [
     script,
-    "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml",
+    "$root_gen_dir/observatory_copy/$current_dir/pubspec.yaml",
   ]
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--stamp",
-    rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/packages.stamp"),
+    rebase_path("$root_gen_dir/observatory_copy/$current_dir/packages.stamp"),
     "--directory",
-    rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/"),
+    rebase_path("$root_gen_dir/observatory_copy/$current_dir/"),
     "--command",
     "get",
   ]
 
   outputs = [
-    "$root_gen_dir/observatory_copy/dart/runtime/observatory/packages.stamp",
+    "$root_gen_dir/observatory_copy/$current_dir/packages.stamp",
   ]
 }
 
 action("pub_build_observatory") {
+  current_dir = rebase_path(".", "//")
   sources =
       rebase_path(observatory_sources_gypi.sources,
                   "",
-                  "$root_gen_dir/observatory_copy/dart/runtime/observatory")
+                  "$root_gen_dir/observatory_copy/$current_dir")
 
   deps = [
     ":copy_observatory",
     ":copy_observatory_deps",
   ]
 
   script = "../../tools/observatory_tool.py"
 
   inputs = [
     script,
-    "$root_gen_dir/observatory_copy/dart/runtime/observatory/packages.stamp",
+    "$root_gen_dir/observatory_copy/$current_dir/packages.stamp",
   ]
   inputs += sources
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--directory",
-    rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/"),
+    rebase_path("$root_gen_dir/observatory_copy/$current_dir/"),
     "--command",
     "build",
     rebase_path("$root_out_dir/observatory/build"),
   ]
 
   outputs = [
     "$root_out_dir/observatory/build/web/main.dart.js",
   ]
 }
 
@@ skipping 17 matching lines @@
     rebase_path("$root_out_dir/observatory"),
     "--command",
     "deploy",
   ]
 
   outputs = [
     "$root_out_dir/observatory/deployed/web/main.dart.js",
   ]
 }
 
-action("archive_observatory") {
-  deps = [
-    ":deploy_observatory",
-  ]
+template("observatory_archive") {
+  assert(defined(invoker.inner_namespace),
+         "Need inner_namespace in $target_name")
+  assert(defined(invoker.outer_namespace),
+         "Need outer_namespace in $target_name")
+  action(target_name) {
+    deps = [
+      ":deploy_observatory",
+    ]
 
-  script = "../tools/create_archive.py"
+    script = "../tools/create_archive.py"
 
   inputs = [
     script,
     "$root_out_dir/observatory/deployed/web/main.dart.js",
   ]
 
-  args = [
-    "--output",
-    rebase_path("$root_gen_dir/observatory/observatory_archive.cc"),
-    "--tar_output",
-    rebase_path("$root_gen_dir/observatory/observatory_archive.tar"),
-    "--outer_namespace", "dart",
-    "--inner_namespace", "observatory",
-    "--name", "observatory_assets_archive",
-    "--client_root", rebase_path("$root_out_dir/observatory/deployed/web/"),
-  ]
+    inner_namespace = invoker.inner_namespace
+    outer_namespace = invoker.outer_namespace
+    output_name = target_name
+    args = [
+      "--output",
+      rebase_path("$root_gen_dir/observatory/${output_name}.cc"),
+      "--tar_output",
+      rebase_path("$root_gen_dir/observatory/${output_name}.tar"),
+      "--outer_namespace", outer_namespace,
+      "--inner_namespace", inner_namespace,
+      "--name", "observatory_assets_archive",
+      "--client_root", rebase_path("$root_out_dir/observatory/deployed/web/"),
+    ]
 
-  outputs = [
-    "$root_gen_dir/observatory/observatory_archive.cc",
-    "$root_gen_dir/observatory/observatory_archive.tar",
-  ]
+    outputs = [
+      "$root_gen_dir/observatory/${output_name}.cc",
+      "$root_gen_dir/observatory/${output_name}.tar",
+    ]
+  }
+}
+
+observatory_archive("embedded_archive_observatory") {
+  outer_namespace = "dart"
+  inner_namespace = "observatory"
 }
 
 source_set("embedded_observatory_archive") {
   deps = [
-    ":archive_observatory",
+    ":embedded_archive_observatory",
   ]
 
   sources = [
-    rebase_path("$root_gen_dir/observatory/observatory_archive.cc"),
+    rebase_path("$root_gen_dir/observatory/embedded_archive_observatory.cc"),
   ]
 }
+
+observatory_archive("standalone_archive_observatory") {
+  outer_namespace = "dart"
+  inner_namespace = "bin"
+}
+
+source_set("standalone_observatory_archive") {
+  deps = [
+    ":standalone_archive_observatory",
+  ]
+
+  sources = [
+    rebase_path("$root_gen_dir/observatory/standalone_archive_observatory.cc"),
+  ]
+}