Dart: Peer packages version bump

Review URL: https://codereview.chromium.org/2001293002 .
diff --git a/mojo/dart/packages/mojo_apptest/CHANGELOG.md b/mojo/dart/packages/mojo_apptest/CHANGELOG.md
index 7afd01c..1d3b116 100644
--- a/mojo/dart/packages/mojo_apptest/CHANGELOG.md
+++ b/mojo/dart/packages/mojo_apptest/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.2.31
+
+  - 28 changes: https://github.com/domokit/mojo/compare/057a062...7615ee5
+
+  MOJO_SDK: 7615ee57250e71eb370a9ad808dbcfba2028eec8
+
 ## 0.2.30
 
   - 21 changes: https://github.com/domokit/mojo/compare/b3a693d...9fee976
diff --git a/mojo/dart/packages/mojo_apptest/pubspec.yaml b/mojo/dart/packages/mojo_apptest/pubspec.yaml
index 4564a64..a36478f 100644
--- a/mojo/dart/packages/mojo_apptest/pubspec.yaml
+++ b/mojo/dart/packages/mojo_apptest/pubspec.yaml
@@ -1,10 +1,10 @@
 author: Chromium Authors <mojo-dev@googlegroups.com>
 dependencies:
-  mojo_sdk: 0.2.26
+  mojo_sdk: 0.2.27
   test: ^0.12.6+1
 description: Test harness for mojo applications
 environment:
   sdk: '>=1.9.0 <2.0.0'
 homepage: https://github.com/domokit/mojo
 name: mojo_apptest
-version: 0.2.30
+version: 0.2.31
diff --git a/mojo/dart/packages/mojom/CHANGELOG.md b/mojo/dart/packages/mojom/CHANGELOG.md
index 31f2eca..ab6dbed 100644
--- a/mojo/dart/packages/mojom/CHANGELOG.md
+++ b/mojo/dart/packages/mojom/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.2.31
+
+  - 28 changes: https://github.com/domokit/mojo/compare/057a062...7615ee5
+
+  MOJO_SDK: 7615ee57250e71eb370a9ad808dbcfba2028eec8
+
 ## 0.2.30
 
   - 21 changes: https://github.com/domokit/mojo/compare/b3a693d...9fee976
diff --git a/mojo/dart/packages/mojom/pubspec.yaml b/mojo/dart/packages/mojom/pubspec.yaml
index 2c2f80e..dba440f 100644
--- a/mojo/dart/packages/mojom/pubspec.yaml
+++ b/mojo/dart/packages/mojom/pubspec.yaml
@@ -3,7 +3,7 @@
   args: '>=0.13.0 <1.0.0'
   crypto: '>=0.9.0 <1.0.0'
   logging: '>=0.11.0 <1.0.0'
-  mojo_sdk: 0.2.26
+  mojo_sdk: 0.2.27
   path: '>=1.3.5 <2.0.0'
   yaml: ^2.1.8
 description: Placeholder for mojom bindings.
@@ -13,4 +13,4 @@
   sdk: '>=1.9.0 <2.0.0'
 homepage: https://github.com/domokit/mojo
 name: mojom
-version: 0.2.30
+version: 0.2.31