[GN] Output external snapshot blobs in out directory.

BUILD.gn

 # Copyright 2014 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.
 
 # Because standalone V8 builds are not supported, assume this is part of a
 # Chromium build.
 import("//build/module_args/v8.gni")
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
@@ skipping 262 matching lines @@
       ":js2c",
       ":js2c_experimental"
     ]
 
     sources = [
       "$target_gen_dir/libraries.bin",
       "$target_gen_dir/libraries_experimental.bin"
     ]
 
     outputs = [
-      "$root_gen_dir/natives_blob.bin"
+      "$root_out_dir/natives_blob.bin"
     ]
 
     script = "tools/concatenate-files.py"
 
     args = rebase_path(sources + outputs, root_build_dir)
   }
 }
 
 action("postmortem-metadata") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
@@ skipping 32 matching lines @@
     "--log-snapshot-positions",
     "--logfile", rebase_path("$target_gen_dir/snapshot.log", root_build_dir),
     rebase_path("$target_gen_dir/snapshot.cc", root_build_dir)
   ]
 
   if (v8_random_seed != "0") {
     args += [ "--random-seed", v8_random_seed ]
   }
 
   if (v8_use_external_startup_data) {
-    outputs += [ "$root_gen_dir/snapshot_blob.bin" ]
+    outputs += [ "$root_out_dir/snapshot_blob.bin" ]
     args += [
       "--startup_blob",
-      rebase_path("$root_gen_dir/snapshot_blob.bin", root_build_dir)
+      rebase_path("$root_out_dir/snapshot_blob.bin", root_build_dir)
     ]
   }
 }
 
 
 ###############################################################################
 # Source Sets (aka static libraries)
 #
 
 source_set("v8_nosnapshot") {
@@ skipping 1102 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }