Run travis scripts with cirrus

Author: liyuqian

.cirrus.yml

@@ -25,3 +25,19 @@ build_android_task:
     ./flutter/tools/gn --android --unoptimized
     ninja -C out/android_debug_unopt
 
+task:
+  container:
+    image: gcr.io/flutter-cirrus/build-engine-image:0.2
+
+  env:
+    CIRRUS_WORKING_DIR: "/tmp/github_repo"
+
+  replace_engine_script: |
+    cd $ENGINE_PATH/src
+    rm -r flutter
+    cp $CIRRUS_WORKING_DIR -r ./flutter
+    gclient sync
+
+  format_script: cd $ENGINE_PATH/src/flutter && ./travis/format.sh
+  build_script: cd $ENGINE_PATH/src/flutter && ./travis/build.sh
+  test_script: cd $ENGINE_PATH/src/flutter && ./travis/test.sh