Uses mojom module names as Dart's package: import URI

mojo/public/tools/bindings/mojom.gni

 # 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.
 
 import("../../mojo_sdk.gni")
 
 # Generate C++ and JavaScript source files from mojom files. The output files
 # will go under the generated file directory tree with the same path as each
 # input file.
 #
@@ skipping 163 matching lines @@
         visibility = target_visibility + invoker.visibility
       }
       script = generator_script
       inputs = generator_sources
       sources = invoker.sources
       outputs = generator_cpp_outputs + generator_dart_outputs +
                 generator_go_outputs + generator_java_outputs +
                 generator_js_outputs + generator_python_outputs
       args = [
         "{{source}}",
-        "--dart_mojo_root=${mojo_root}",
         "--use_bundled_pylibs",
         "-d",
         rebase_path("//", root_build_dir),
         "-I",
         rebase_path("//", root_build_dir),
         "-I",
         rebase_path(mojo_root, root_build_dir),
         "-o",
         rebase_path(root_gen_dir),
       ]
@@ skipping 183 matching lines @@
         full_name = get_label_info(d, "label_no_toolchain")
         deps += [ "${full_name}_java" ]
       }
 
       if (defined(invoker.sources)) {
         srcjars = process_file_template(invoker.sources, generator_java_outputs)
       }
     }
   }
 }