Build dart:zircon and dart:zircon_ffi (flutter/engine#28071)

engine/src/flutter/shell/platform/fuchsia/BUILD.gn

@@ -77,6 +77,7 @@ group("fuchsia") {
   deps = [
     ":dart_binaries",
     ":flutter_binaries",
+    "dart-pkg",
     "dart_runner:dart_aot_${product_suffix}runner",
     "dart_runner:dart_jit_${product_suffix}runner",
     "flutter:flutter_aot_${product_suffix}runner",

engine/src/flutter/shell/platform/fuchsia/dart-pkg/BUILD.gn

@@ -0,0 +1,7 @@
+# Copyright 2013 The Flutter 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-pkg") {
+  deps = [ "zircon:dart_zircon" ]
+}

engine/src/flutter/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn

@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/fuchsia/sdk.gni")
+import("//flutter/tools/fuchsia/dart/dart_library.gni")
 
 config("zircon_config") {
   include_dirs = [ "." ]
@@ -35,3 +36,18 @@ source_set("zircon") {
     "//flutter/third_party/tonic",
   ]
 }
+
+dart_library("dart_zircon") {
+  package_name = "zircon"
+
+  sources = [
+    "src/handle.dart",
+    "src/handle_disposition.dart",
+    "src/handle_waiter.dart",
+    "src/init.dart",
+    "src/system.dart",
+    "zircon.dart",
+  ]
+
+  deps = [ "../zircon_ffi:dart_zircon_ffi" ]
+}

engine/src/flutter/shell/platform/fuchsia/dart-pkg/zircon_ffi/BUILD.gn

@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/fuchsia/sdk.gni")
+import("//flutter/tools/fuchsia/dart/dart_library.gni")
 
 config("zircon_ffi_config") {
   include_dirs = [ "." ]
@@ -21,3 +22,9 @@ shared_library("zircon_ffi") {
     "//third_party/dart/runtime:dart_api",
   ]
 }
+
+dart_library("dart_zircon_ffi") {
+  package_name = "zircon_ffi"
+
+  sources = [ "zircon_ffi.dart" ]
+}

engine/src/flutter/tools/.vpython

@@ -0,0 +1,4 @@
+wheel: <
+  name: "infra/python/wheels/pyyaml/${vpython_platform}"
+  version: "version:3.12"
+>

engine/src/flutter/tools/.vpython3

@@ -0,0 +1,5 @@
+python_version: "3.8"
+wheel: <
+  name: "infra/python/wheels/pyyaml-py3"
+  version: "version:5.3.1"
+>

engine/src/flutter/tools/fuchsia/dart/dart_package_config.gni

@@ -77,9 +77,7 @@ template("dart_package_config") {
                              "visibility",
                            ])
 
-    script =
-        get_label_info("//flutter/tools/fuchsia/dart:gen_dart_package_config",
-                       "target_out_dir") + "/gen_dart_package_config.pyz"
+    script = "//flutter/tools/fuchsia/dart/gen_dart_package_config.py"
 
     inputs = [ intermediate_file ]
     outputs = [ package_config_file ]

engine/src/flutter/tools/fuchsia/dart/gen_dart_package_config.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3.8
+#!/usr/bin/env vpython3
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

engine/src/flutter/tools/fuchsia/sdk/find_dart_libraries.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env vpython3
 #
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be

engine/src/flutter/tools/gn

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env vpython3
 # Copyright 2013 The Flutter Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

engine/src/flutter/tools/python/run_python3_action.py

@@ -1,10 +1,10 @@
-#!/usr/bin/env python
+#!/usr/bin/env vpython3
 #
 # Copyright 2021 The Flutter 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 os
 import sys
+import subprocess
 
-os.execv('/usr/bin/python3', ['python3'] + sys.argv[1:])
+subprocess.run(['vpython3'] + sys.argv[1:])