Implement `gn analyze`.

tools/gn/BUILD.gn

 # Copyright (c) 2013 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("//testing/test.gni")
 
 defines = [ "GN_BUILD" ]
 
 static_library("gn_lib") {
   configs += [ "//build/config:precompiled_headers" ]
@@ skipping 14 matching lines @@
     "builder_record.cc",
     "builder_record.h",
     "bundle_data.cc",
     "bundle_data.h",
     "bundle_data_target_generator.cc",
     "bundle_data_target_generator.h",
     "bundle_file_rule.cc",
     "bundle_file_rule.h",
     "c_include_iterator.cc",
     "c_include_iterator.h",
+    "command_analyze.cc",
     "command_args.cc",
     "command_check.cc",
     "command_clean.cc",
     "command_desc.cc",
     "command_format.cc",
     "command_gen.cc",
     "command_help.cc",
     "command_ls.cc",
     "command_path.cc",
     "command_refs.cc",
@@ skipping 35 matching lines @@
     "function_read_file.cc",
     "function_rebase_path.cc",
     "function_set_default_toolchain.cc",
     "function_set_defaults.cc",
     "function_template.cc",
     "function_toolchain.cc",
     "function_write_file.cc",
     "functions.cc",
     "functions.h",
     "functions_target.cc",
+    "graph.cc",
+    "graph.h",
     "group_target_generator.cc",
     "group_target_generator.h",
     "header_checker.cc",
     "header_checker.h",
     "import_manager.cc",
     "import_manager.h",
     "inherited_libraries.cc",
     "inherited_libraries.h",
     "input_conversion.cc",
     "input_conversion.h",
@@ skipping 187 matching lines @@
     "function_get_label_info_unittest.cc",
     "function_get_path_info_unittest.cc",
     "function_get_target_outputs_unittest.cc",
     "function_process_file_template_unittest.cc",
     "function_rebase_path_unittest.cc",
     "function_template_unittest.cc",
     "function_toolchain_unittest.cc",
     "function_write_file_unittest.cc",
     "functions_target_unittest.cc",
     "functions_unittest.cc",
+    "graph_unittest.cc",
     "header_checker_unittest.cc",
     "inherited_libraries_unittest.cc",
     "input_conversion_unittest.cc",
     "label_pattern_unittest.cc",
     "label_unittest.cc",
     "loader_unittest.cc",
     "ninja_action_target_writer_unittest.cc",
     "ninja_binary_target_writer_unittest.cc",
     "ninja_build_writer_unittest.cc",
     "ninja_bundle_data_target_writer_unittest.cc",
@@ skipping 32 matching lines @@
     "format_test_data/",
   ]
 
   deps = [
     ":gn_lib",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gtest",
   ]
 }