[ci] Initial setup for Windows LUCI bots (#478)

Creates an initial set of scripts to do minimal testing on Windows, and
builders to run those scripts. The recipe the builders reference does
not currently exist, but will be brought up in parallel.

This follows exactly the same structure that was successfully deployed
to flutter/plugins.

.ci.yaml

@@ -14,8 +14,48 @@ platform_properties:
     properties:
       fuchsia_ctl_version: ""
       os: Linux
+  windows:
+    properties:
+      caches: >-
+        [
+          {"name": "vsbuild", "path": "vsbuild"},
+          {"name": "pub_cache", "path": ".pub-cache"}
+        ]
+      dependencies: >
+        [
+          {"dependency": "certs"}
+        ]
+      device_type: none
+      os: Windows
 
 targets:
+  - name: Windows win32-platform_tests master
+    bringup: true
+    recipe: packages/packages
+    timeout: 30
+    properties:
+      add_recipes_cq: "true"
+      target_file: windows_build_and_platform_tests.yaml
+      dependencies: >
+        [
+          {"dependency": "vs_build"}
+        ]
+    scheduler: luci
+
+  - name: Windows win32-platform_tests stable
+    bringup: true
+    recipe: packages/packages
+    timeout: 30
+    properties:
+      add_recipes_cq: "true"
+      target_file: windows_build_and_platform_tests.yaml
+      channel: stable
+      dependencies: >
+        [
+          {"dependency": "vs_build"}
+        ]
+    scheduler: luci
+
   - name: Linux fuchsia_ctl
     postsubmit: false
     recipe: fuchsia_ctl

.ci/scripts/build_examples_win32.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+dart pub global run flutter_plugin_tools build-examples --windows \
+   --packages-for-branch

.ci/scripts/native_test_win32.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+dart pub global run flutter_plugin_tools native-test --windows \
+   --no-integration --packages-for-branch

.ci/scripts/prepare_tool.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# To set FETCH_HEAD for "git merge-base" to work
+git fetch origin master
+
+# Pinned version of the plugin tools, to avoid breakage in this repository
+# when pushing updates from flutter/plugins.
+dart pub global activate flutter_plugin_tools 0.7.1

.ci/targets/windows_build_and_platform_tests.yaml

@@ -0,0 +1,7 @@
+tasks:
+  - name: prepare tool
+    script: .ci/scripts/prepare_tool.sh
+  - name: build examples (Win32)
+    script: .ci/scripts/build_examples_win32.sh
+  - name: native unit tests (Win32)
+    script: .ci/scripts/native_test_win32.sh

.cirrus.yml

@@ -5,10 +5,7 @@ env:
 
 tool_setup_template: &TOOL_SETUP_TEMPLATE
   tool_setup_script:
-    - git fetch origin master # To set FETCH_HEAD for "git merge-base" to work
-    # Pinned version of the plugin tools, to avoid breakage in this repository
-    # when pushing updates from flutter/plugins.
-    - dart pub global activate flutter_plugin_tools 0.7.1
+    - .ci/scripts/prepare_tool.sh
 
 flutter_upgrade_template: &FLUTTER_UPGRADE_TEMPLATE
   upgrade_flutter_script: