create dartdoc snapshot, add to dart-sdk. Also add resources needed to run dartdoc from the sdk.

utils/dartdoc/dartdoc.gyp

Index: utils/dartdoc/dartdoc.gyp
diff --git a/utils/dartfmt/dartfmt.gyp b/utils/dartdoc/dartdoc.gyp
similarity index 74%
copy from utils/dartfmt/dartfmt.gyp
copy to utils/dartdoc/dartdoc.gyp
index 62b890614a94999a7f8848a8573381fd36d46928..73c4fa42fd5835aaceade0afb699c873fb93ae92 100644
--- a/utils/dartfmt/dartfmt.gyp
+++ b/utils/dartdoc/dartdoc.gyp
@@ -5,7 +5,7 @@
 {
   'targets': [
     {
-      'target_name': 'dartfmt',
+      'target_name': 'dartdoc',
       'type': 'none',
       'dependencies': [
         '../../runtime/dart-runtime.gyp:dart',
@@ -13,24 +13,24 @@
       ],
       'actions': [
         {
-          'action_name': 'generate_dartfmt_snapshot',
+          'action_name': 'generate_dartdoc_snapshot',
           'inputs': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             '../../sdk/lib/_internal/sdk_library_metadata/lib/libraries.dart',
             '<(SHARED_INTERMEDIATE_DIR)/packages.stamp',
-            '<!@(["python", "../../tools/list_files.py", "\\.dart$", "../../third_party/pkg_tested/dart_style"])',
+            '<!@(["python", "../../tools/list_files.py", "\\.dart$", "../../third_party/pkg/dartdoc"])',
           ],
           'outputs': [
-            '<(SHARED_INTERMEDIATE_DIR)/dartfmt.dart.snapshot',
+            '<(SHARED_INTERMEDIATE_DIR)/dartdoc.dart.snapshot',
           ],
           'action': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
-            '--snapshot=<(SHARED_INTERMEDIATE_DIR)/dartfmt.dart.snapshot',
+            '--snapshot=<(SHARED_INTERMEDIATE_DIR)/dartdoc.dart.snapshot',
             '--package-root=<(PRODUCT_DIR)/packages/',
-            '../../third_party/pkg_tested/dart_style/bin/format.dart',
+            '../../third_party/pkg/dartdoc/bin/dartdoc.dart',
           ],
         },
       ],
     },
   ],
-}
+}