GN: Build the SDK with app snapshots instead of script snapshots.

utils/dartanalyzer/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.
 
 import("../invoke_dart.gni")
 
 group("dartanalyzer") {
   deps = [
     ":generate_dartanalyzer_snapshot",
     ":generate_summary_spec",
     ":generate_summary_strong",
   ]
 }
 
 analyzer_files = exec_script("../../tools/list_dart_files.py",
                              [rebase_path("../../pkg/analyzer")],
                              "list lines")
 
 application_snapshot("generate_dartanalyzer_snapshot") {
   main_dart = "../../pkg/analyzer_cli/bin/analyzer.dart"
+  training_args = [
+    "--dart-sdk=" + rebase_path("../../sdk"),
+    rebase_path("../../tests/language/first_test.dart")
+  ]
   name = "dartanalyzer"
   cli_files = exec_script("../../tools/list_dart_files.py",
                           [rebase_path("../../pkg/analyzer_cli")],
                           "list lines")
   inputs = cli_files + analyzer_files
 }
 
 sdk_lib_files = exec_script("../../tools/list_dart_files.py",
                             [rebase_path("../../sdk/lib")],
                             "list lines")
@@ skipping 25 matching lines @@
   }
 }
 
 generate_summary("generate_summary_spec") {
   type = "spec"
 }
 
 generate_summary("generate_summary_strong") {
   type = "strong"
 }