Support Package Resolution Configuration files.

tools/deps/dartium.deps/DEPS

Index: tools/deps/dartium.deps/DEPS
diff --git a/tools/deps/dartium.deps/DEPS b/tools/deps/dartium.deps/DEPS
index 65c121db4c1a88a190db63463f7f63bb7e037b34..8e485f9cd35741c518b638de9aa73e101733bca5 100644
--- a/tools/deps/dartium.deps/DEPS
+++ b/tools/deps/dartium.deps/DEPS
@@ -31,6 +31,7 @@ vars.update({
   "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",
@@ -133,6 +134,9 @@ deps.update({
       "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":