Rename snapshot, other user-visible parts of docgen to dartdocgen.

utils/apidoc/docgen.gyp

 # Copyright (c) 2012, 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.
 
 {
   'variables' : {
     'script_suffix%': '',
   },
   'conditions' : [
     ['OS=="win"', {
@@ skipping 45 matching lines @@
           'inputs': [
             '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
             '<(SHARED_INTERMEDIATE_DIR)/utils_wrapper.dart.snapshot',
             '<!@(["python", "../../tools/list_files.py", "\\.(css|ico|js|json|png|sh|txt|yaml|py)$", ".", "../../sdk/lib/_internal/dartdoc"])',
             # We implicitly depend on the sdk/lib and vm runtime files by depending on the dart binary above.
             '<!@(["python", "../../tools/list_files.py", "\\.dart$", "."])',
             '../../sdk/bin/dart',
             '../../sdk/bin/dart.bat',
             '../../sdk/bin/dart2js',
             '../../sdk/bin/dart2js.bat',
+            # TODO(alanknight): The docgen name is deprecated in favour of
+            # dartdocgen, and should be removed eventually.
             '../../sdk/bin/docgen',
+            '../../sdk/bin/dartdocgen',
             '../../sdk/bin/docgen.bat',
+            '../../sdk/bin/dartdocgen.bat',
             '../../tools/only_in_release_mode.py',
             '<(PRODUCT_DIR)/dart-sdk/README',
             '<(SHARED_INTERMEDIATE_DIR)/pkg_files.stamp',
           ],
           'outputs': [
             '<(PRODUCT_DIR)/api_docs/docgen/index.json',
           ],
           'action': [
             'python',
             '../../tools/only_in_release_mode.py',
             '<@(_outputs)',
             '--',
-            '<(PRODUCT_DIR)/dart-sdk/bin/docgen<(script_suffix)',
+            '<(PRODUCT_DIR)/dart-sdk/bin/dartdocgen<(script_suffix)',
             '--out=<(PRODUCT_DIR)/api_docs/docgen',
             '--include-sdk',
             '--no-include-dependent-packages',
             '--package-root=<(PRODUCT_DIR)/packages',
             '--exclude-lib=async_helper',
             '--exclude-lib=compiler',
             '--exclude-lib=dart2js_incremental',
             '--exclude-lib=docgen',
             '--exclude-lib=expect',
             '--exclude-lib=try',
             '../../pkg'
           ],
-          'message': 'Running docgen: <(_action)',
+          'message': 'Running dartdocgen: <(_action)',
         },
       ],
     }
   ],
 }