Initial commit of travis.yml.

BUG=

Review URL: https://chromiumcodereview.appspot.com//867533004
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..82c72d2
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,3 @@
+language: dart
+script: ./tool/travis.sh
+