[infra] Uses github mirror for protobuf and tuple.

DEPS

 # 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.
 
+# IMPORTANT:
+# Before adding or updating dependencies, please review the documentation here:
+# https://github.com/dart-lang/sdk/wiki/Adding-and-Updating-Dependencies
+
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # We use mirrors of all github repos to guarantee reproducibility and
   # consistency between what users see and what the bots see.
   # We need the mirrors to not have 100+ bots pulling github constantly.
   # We mirror our github repos on chromium git servers.
   # DO NOT use this var if you don't see a mirror here:
   #   https://chromium.googlesource.com/
   # named like:
   #   external/github.com/dart-lang/NAME
-  # It is ok to add a dependency directly on dart-lang (dart-lang only)
-  # github repo until the mirror has been created, but please do file a bug
-  # against infra to make that happen.
   "github_mirror":
       "https://chromium.googlesource.com/external/github.com/dart-lang/%s.git",
 
   # Chromium git
   "chromium_git": "https://chromium.googlesource.com",
   "fuchsia_git": "https://fuchsia.googlesource.com",
 
-  # Only use this temporarily while waiting for a mirror for a new package.
-  "github_dartlang": "https://github.com/dart-lang/%s.git",
+  # IMPORTANT:
+  # This should only be used for local testing. Before adding a new package,
+  # request a mirror of the package you need. To request a mirror, file an issue
+  # on github and add the label 'area-infrastructure'.
+  # "github_dartlang": "https://github.com/dart-lang/%s.git",
 
   "gyp_rev": "@6ee91ad8659871916f9aa840d42e1513befdf638",
   "co19_rev": "@4af9ef149be554216c5bb16cbac8e50d4c28cdf1",
 
   # Revisions of GN related dependencies. This should match the revision
   # pulled by Flutter.
   "buildtools_revision": "@057ef89874e3c622248cf99259434fdc683c4e30",
 
   # Scripts that make 'git cl format' work.
   "clang_format_scripts_rev": "@c09c8deeac31f05bd801995c475e7c8070f9ecda",
@@ skipping 227 matching lines @@
       Var("package_config_tag"),
   Var("dart_root") + "/third_party/pkg_tested/package_resolver":
       (Var("github_mirror") % "package_resolver") + Var("package_resolver_tag"),
   Var("dart_root") + "/third_party/pkg/path":
       (Var("github_mirror") % "path") + Var("path_tag"),
   Var("dart_root") + "/third_party/pkg/plugin":
       (Var("github_mirror") % "plugin") + Var("plugin_tag"),
   Var("dart_root") + "/third_party/pkg/pool":
       (Var("github_mirror") % "pool") + Var("pool_tag"),
   Var("dart_root") + "/third_party/pkg/protobuf":
-      # Restore the github mirror once it's corrected to point to protobuf
-      # instead of dart-protobuf
-      # (Var("github_mirror") % "dart-protobuf") + Var("protobuf_tag"),
-      (Var("github_dartlang") % "protobuf") + Var("protobuf_tag"),
+      (Var("github_mirror") % "protobuf") + Var("protobuf_tag"),
   Var("dart_root") + "/third_party/pkg/pub_semver":
       (Var("github_mirror") % "pub_semver") + Var("pub_semver_tag"),
   Var("dart_root") + "/third_party/pkg/pub":
       (Var("github_mirror") % "pub") + Var("pub_rev"),
   Var("dart_root") + "/third_party/pkg/quiver":
       Var("chromium_git")
       + "/external/github.com/google/quiver-dart.git"
       + Var("quiver_tag"),
   Var("dart_root") + "/third_party/pkg/resource":
       (Var("github_mirror") % "resource") + Var("resource_rev"),
@@ skipping 28 matching lines @@
       Var("string_scanner_tag"),
   Var("dart_root") + "/third_party/sunflower":
       (Var("github_mirror") % "sample-sunflower") +
       Var("sunflower_rev"),
   Var("dart_root") + "/third_party/pkg/test":
       (Var("github_mirror") % "test") + Var("test_tag"),
   Var("dart_root") + "/third_party/pkg/test_reflective_loader":
       (Var("github_mirror") % "test_reflective_loader") +
       Var("test_reflective_loader_tag"),
   Var("dart_root") + "/third_party/pkg/tuple":
-      (Var("github_dartlang") % "tuple") + Var("tuple_tag"),
+      (Var("github_mirror") % "tuple") + Var("tuple_tag"),
   Var("dart_root") + "/third_party/pkg/typed_data":
       (Var("github_mirror") % "typed_data") + Var("typed_data_tag"),
   Var("dart_root") + "/third_party/pkg/usage":
       (Var("github_mirror") % "usage") + Var("usage_tag"),
   Var("dart_root") + "/third_party/pkg/utf":
       (Var("github_mirror") % "utf") + Var("utf_tag"),
   Var("dart_root") + "/third_party/pkg/watcher":
       (Var("github_mirror") % "watcher") + Var("watcher_tag"),
   Var("dart_root") + "/third_party/pkg/web_components":
       (Var("github_mirror") % "web-components") +
@@ skipping 149 matching lines @@
     # Update the Windows toolchain if necessary.
     'name': 'win_toolchain',
     'pattern': '.',
     'action': ['python', 'sdk/build/vs_toolchain.py', 'update'],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/generate_buildfiles.py"],
   },
 ]