Run dartanalyzer by default.

mojo/public/dart/rules.gni

 # Copyright 2015 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.
 
 # Rules to generate python packaged applications for Dart
 
 import("../mojo_sdk.gni")
 
 template("dart_package") {
   action(target_name) {
@@ skipping 105 matching lines @@
     inputs = [
       input,
     ]
 
     output = mojo_output
     outputs = [
       output,
     ]
 
     deps = [
-      # TODO(erg): When dartanalyze runs at an acceptable speed, add
-      # ":$package_analyze_sources" as a dependency here and remove the
-      # manual group("check") in the toplevel build file.
+      ":$package_analyze_sources",
       ":$package_name",
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
     if (defined(invoker.mojom_deps)) {
       deps += invoker.mojom_deps
     }
     if (defined(invoker.datadeps)) {
       datadeps = invoker.datadeps
     }
 
     line = "#!mojo mojo:dart_content_handler"
     if (defined(invoker.strict) && invoker.strict == true) {
       line = "#!mojo mojo:dart_content_handler?strict=true"
     }
 
     rebase_input = rebase_path(input, root_build_dir)
     rebase_output = rebase_path(output, root_build_dir)
     args = [
       "--input=$rebase_input",
       "--output=$rebase_output",
       "--line=$line",
     ]
   }
 }