[Fuchsia] Adds an option to create_sdk.py to skip binary stripping

BUILD.gn

 # Copyright (c) 2016, 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.
 
 # This target will be built if no target is specified when invoking ninja.
 group("default") {
   if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
     # Fuchsia has run_vm_tests marked testonly.
     testonly = true
   }
@@ skipping 119 matching lines @@
   script = "tools/create_sdk.py"
   args = [
     "--sdk_output_dir",
     rebase_path("$root_out_dir/dart-sdk"),
     "--snapshot_location",
     rebase_path("$root_gen_dir"),
   ]
   if (defined(is_fuchsia) && is_fuchsia_host) {
     args += [ "--copy_libs" ]
   }
+  if (defined(is_fuchsia) && (is_fuchsia || is_fuchsia_host)) {
+    # The binaries are already stripped.
+    args += [ "--disable_stripping" ]
+  }
 }
 
 group("dart2js") {
   deps = [
     "utils/compiler:dart2js",
   ]
 }
 
 group("dartanalyzer") {
   deps = [
@@ skipping 99 matching lines @@
         rebase_path(input),
         "--output-file",
         rebase_path(output),
         "--build-id-map",
         rebase_path("$target_gen_dir/build_id_map"),
         "--compress",
       ]
     }
   }
 }