Support Package Resolution Configuration files.

tools/deps/dartium.deps/DEPS

 import gclient_utils
 import os
 
 path = gclient_utils.FindGclientRoot(os.getcwd())
 execfile(os.path.join(path, 'src', 'dart', 'tools', 'deps', 'dartium.deps', 'DEPS.chromium')) # Include proper Chromium DEPS.
 
 # Now we need to override some settings and add some new ones.
 
 vars.update({
   "chromium_url": "http://src.chromium.org/svn",
@@ skipping 13 matching lines @@
   "http_multi_server_tag" : "@1.3.2",
   "http_parser_rev" : "@8b179e36aba985208e4c5fb15cfddd386b6370a4",
   "http_throttle_rev" : "@a81f08be942cdd608883c7b67795c12226abc235",
   "json_rpc_2_rev": "@a38eefd116d910199de205f962af92fed87c164c",
   "logging_rev": "@85d83e002670545e9039ad3985f0018ab640e597",
   "matcher_tag": "@0.12.0",
   "mime_rev": "@75890811d4af5af080351ba8a2853ad4c8df98dd",
   "metatest_rev": "@e5aa8e4e19fc4188ac2f6d38368a47d8f07c3df1",
   "oauth2_rev": "@1bff41f4d54505c36f2d1a001b83b8b745c452f5",
   "observatory_pub_packages_rev": "@45565",
+  "package_config_tag": "@0.0.3+1",
   "path_rev": "@b657c0854d1cf41c014986fa9d2321f1173df805",
   "plugin_tag": "@0.1.0",
   "pool_rev": "@22e12aeb16ad0b626900dbe79e4a25391ddfb28c",
   "pub_rev": "@9d707158fedc86fc2b02f62cdfe804902b098d9d",
   "pub_semver_tag": "@1.2.0",
   "shelf_rev": "@1e87b79b21ac5e6fa2f93576d6c06eaa65285ef4",
   "shelf_web_socket_rev": "@ff170cec2c0e4e5722cdf47c557be63b5035a602",
   "source_span_rev": "@42501132e43599a151ba6727d340e44442f86c05",
   "stack_trace_tag": "@1.2.1",
   "string_scanner_rev": "@3e7617d6f74ba382e9b6130b1cc12091d89a9bc5",
@@ skipping 82 matching lines @@
   "src/dart/third_party/pkg/args":
       "https://github.com/dart-lang/args.git" + Var("args_tag"),
   "src/dart/third_party/pkg/http_parser":
       "https://github.com/dart-lang/http_parser.git" + Var("http_parser_rev"),
   "src/dart/third_party/pkg/matcher":
       "https://github.com/dart-lang/matcher.git" + Var("matcher_tag"),
   "src/dart/third_party/pkg/metatest":
       "https://github.com/dart-lang/metatest.git" + Var("metatest_rev"),
   "src/dart/third_party/pkg/path":
       "https://github.com/dart-lang/path.git" + Var("path_rev"),
+  "src/dart/third_party/pkg/package_config":
+      "https://github.com/dart-lang/package_config.git" +
+      Var("package_config_tag"),
   "src/dart/third_party/pkg/source_span":
       "https://github.com/dart-lang/source_span.git" + Var("source_span_rev"),
   "src/dart/third_party/pkg/stack_trace":
       "https://github.com/dart-lang/stack_trace.git" + Var("stack_trace_tag"),
   "src/dart/third_party/pkg/string_scanner":
       "https://github.com/dart-lang/string_scanner.git" +
       Var("string_scanner_rev"),
   "src/dart/third_party/pkg/test":
       "https://github.com/dart-lang/test.git" + Var("test_tag"),
   # TODO(sigmund): should be src/dart/third_party/pkg/unittest (dartbug.com/21949)
@@ skipping 63 matching lines @@
     "download_from_google_storage",
     "--no_auth",
     "--no_resume",
     "--bucket",
     "dart-dependencies",
     "-d",
     "-r",
     "src/dart/tools/testing/bin",
   ],
 })