[infra] Assembles the SDK using GN rather than create_sdk.py

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.
 
 import("gypi_contents.gni")
 import("../runtime_args.gni")
 import("../../build/compiled_action.gni")
 
 # Generate a resources.cc file for the service isolate without Observatory.
 action("gen_resources_cc") {
@@ skipping 301 matching lines @@
   if (is_win) {
     libs = [
       "iphlpapi.lib",
       "psapi.lib",
       "ws2_32.lib",
       "Rpcrt4.lib",
       "winmm.lib",
     ]
   }
 
-  if (defined(is_fuchsia) && is_fuchsia) {
+  if (is_fuchsia) {
     libs = [ "launchpad" ]
   }
 }
 
 # A source set for the implementation of 'dart:io' library
 # (without secure sockets) suitable for linking with gen_snapshot.
 source_set("gen_snapshot_dart_io") {
   configs += [
     "..:dart_config",
     "..:dart_maybe_product_config",
@@ skipping 70 matching lines @@
         "Security.framework",
       ]
 
       if (is_mac) {
         libs += [ "CoreServices.framework" ]
       }
     } else {
       deps += [ "//third_party/boringssl" ]
     }
 
-    if (defined(is_fuchsia) && is_fuchsia) {
+    if (is_fuchsia) {
       libs = [ "launchpad" ]
     }
 
     sources = io_impl_sources_gypi + builtin_impl_sources_gypi
     sources += [
                  "builtin_natives.cc",
                  "io_natives.cc",
                  "io_natives.h",
                  "log_android.cc",
                  "log_linux.cc",
                  "log_macos.cc",
                  "log_win.cc",
                  "log.h",
                ] + extra_sources
 
-    if (is_linux || is_win || (defined(is_fuchsia) && is_fuchsia)) {
+    if (is_linux || is_win || is_fuchsia) {
       if (dart_use_fallback_root_certificates) {
         sources += [ "//third_party/root_certificates/root_certificates.cc" ]
       } else {
         defines += [ "DART_IO_ROOT_CERTS_DISABLED" ]
       }
     }
 
     include_dirs = [
       "..",
       "//third_party",
@@ skipping 159 matching lines @@
     if (is_win) {
       libs = [
         "iphlpapi.lib",
         "psapi.lib",
         "ws2_32.lib",
         "Rpcrt4.lib",
         "winmm.lib",
       ]
     }
 
-    if (defined(is_fuchsia) && is_fuchsia) {
+    if (is_fuchsia) {
       libs = [ "launchpad" ]
     }
   }
 }
 
 dart_executable("dart") {
   extra_deps = [
     "..:libdart_jit",
     ":dart_snapshot_cc",
     "../observatory:standalone_observatory_archive",
@@ skipping 55 matching lines @@
     "$target_gen_dir/indexed_db_gen.cc",
     "$target_gen_dir/cached_patches_gen.cc",
     "$target_gen_dir/web_gl_gen.cc",
     "$target_gen_dir/metadata_gen.cc",
     "$target_gen_dir/web_sql_gen.cc",
     "$target_gen_dir/svg_gen.cc",
     "$target_gen_dir/web_audio_gen.cc",
   ]
 }
 
-if (defined(is_fuchsia) && is_fuchsia) {
+if (is_fuchsia) {
   hello_fuchsia_source = rebase_path("../tests/vm/dart/hello_fuchsia_test.dart")
 
   copy("hello_fuchsia") {
     sources = [
       hello_fuchsia_source,
     ]
     outputs = [
       "$root_out_dir/hello_fuchsia.dart",
     ]
   }
@@ skipping 58 matching lines @@
     rebase_path(snapshot_test_in_dat_file),
     "--include",
     "INTENTIONALLY_LEFT_BLANK",
     "--var_name",
     "INTENTIONALLY_LEFT_BLANK_TOO",
     rebase_path(snapshot_test_dart_file),
   ]
 }
 
 executable("run_vm_tests") {
-  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+  if (is_fuchsia || is_fuchsia_host) {
     testonly = true
   }
 
   configs += [
     "..:dart_config",
     "..:dart_maybe_product_config",
   ]
 
   deps = [
     ":dart_snapshot_cc",
@@ skipping 76 matching lines @@
   ]
   if (is_linux || is_android) {
     cflags = [ "-fPIC" ]
   }
   if (is_win) {
     libs = [ "dart.lib" ]
     abs_root_out_dir = rebase_path(root_out_dir)
     ldflags = [ "/LIBPATH:$abs_root_out_dir" ]
   }
 }