Add an option to build the GLFW shell on macOS

DEPS

@@ -121,7 +121,7 @@ allowed_hosts = [
 ]
 
 deps = {
-  'src': 'https://github.com/flutter/buildroot.git' + '@' + '5311c632822d0d2d4e4cf8cba3053cde5183c89c',
+  'src': 'https://github.com/flutter/buildroot.git' + '@' + '94695026d9a1d8963089a470eef26470312c5b00',
 
    # Fuchsia compatibility
    #

shell/platform/darwin/BUILD.gn

@@ -14,7 +14,7 @@ group("darwin") {
   }
   if (is_mac) {
     deps = [
-      "macos:flutter_framework",
+      "macos",
     ]
   }
 }

shell/platform/darwin/macos/BUILD.gn

@@ -7,6 +7,21 @@ assert(is_mac)
 import("//build/config/mac/mac_sdk.gni")
 import("$flutter_root/common/config.gni")
 import("$flutter_root/shell/platform/darwin/framework_shared.gni")
+import("$flutter_root/shell/platform/glfw/config.gni")
+
+group("macos") {
+  deps = [
+    ":flutter_framework",
+  ]
+  if (build_glfw_shell) {
+    deps += [
+      ":flutter_macos_glfw",
+      "$flutter_root/shell/platform/common/cpp/client_wrapper:publish_wrapper",
+      "$flutter_root/shell/platform/glfw:publish_headers_glfw",
+      "$flutter_root/shell/platform/glfw/client_wrapper:publish_wrapper_glfw",
+    ]
+  }
+}
 
 _flutter_framework_name = "FlutterMacOS"
 _flutter_framework_filename = "$_flutter_framework_name.framework"
@@ -194,3 +209,13 @@ group("flutter_framework") {
     ":_generate_symlinks",
   ]
 }
+
+if (build_glfw_shell) {
+  shared_library("flutter_macos_glfw") {
+    deps = [
+      "$flutter_root/shell/platform/glfw:flutter_glfw",
+    ]
+
+    public_configs = [ "$flutter_root:config" ]
+  }
+}

shell/platform/glfw/config.gni

@@ -0,0 +1,13 @@
+# 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.
+
+declare_args() {
+  # Whether to build the GLFW shell for the host platform, if available.
+  #
+  # By default, the GLFW shell is not built if there is a native toolkit shell,
+  # but it can be enabled for supported platforms (Windows, macOS, and Linux)
+  # as an extra build artifact with this flag. The native toolkit shell will
+  # still be built as well.
+  build_glfw_shell = is_linux || is_win
+}