Bring in the latest pub. (#28035)

CHANGELOG.md

@@ -1,3 +1,26 @@
+## 1.22.0
+
+### Tool changes
+
+* Pub
+
+  * Avoid using a barback asset server for executables unless they actually use
+    transformers. This makes precompilation substantially faster, produces
+    better error messages when precompilation fails, and allows
+    globally-activated executables to consistently use the
+    `Isolate.resolvePackageUri()` API.
+
+  * On POSIX systems, always ignore packages' original file owners and
+    permissions when extracting those packages. This was already the default
+    under most circumstances.
+
+  * Properly close the standard input stream of child processes started using
+    `pub run`.
+
+  * Handle parse errors from the package cache more gracefully. A package whose
+    pubspec can't be parsed will now be ignored by `pub get --offline` and
+    deleted by `pub cache repair`.
+
 ## 1.21.0 - 2016-12-07
 
 ### Language

DEPS

@@ -90,7 +90,7 @@ vars = {
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_tag": "@1.2.4",
   "protobuf_tag": "@0.5.3",
-  "pub_rev": "@3dd04bd17ba269ccdd34502a253041dd96ded3be",
+  "pub_rev": "@3dc6777fabfd27cd80cd4eff45c8d0f9ecb4aa7a",
   "pub_semver_tag": "@1.3.0",
   "quiver_tag": "@0.22.0",
   "resource_rev":"@a49101ba2deb29c728acba6fb86000a8f730f4b1",