TBR croupier: Add Dart Path (to pub/dart sdk) to Makefile

This should help the tests pass on Jenkins.

Change-Id: Ia4a39645d7163f803cd2d5d4ff8dfcf505e20a9f
diff --git a/Makefile b/Makefile
index b1a94d1..b25dc01 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,9 @@
 DART_TEST_FILES_ALL := $(shell find test -name *.dart)
 DART_TEST_FILES := $(shell find test -name *.dart ! -name *.part.dart)
 
+# Add Dart SDK to path.
+PATH := $(shell jiri v23-profile env --profiles=dart DART_SDK=)/bin:$(PATH)
+
 # This section is used to setup the environment for running with mojo_shell.
 CROUPIER_DIR := $(shell pwd)
 DISCOVERY_DIR := $(JIRI_ROOT)/release/mojo/discovery
diff --git a/pubspec.lock b/pubspec.lock
index e69ab51..4360dd9 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -20,7 +20,7 @@
   async:
     description: async
     source: hosted
-    version: "1.4.0"
+    version: "1.5.0"
   barback:
     description: barback
     source: hosted