[ci] More cirrus.yml pre-alignment with flutter/plugins (#3141)

* Remove unused script argument

* Move dart_unit_tests to the platform-agnostic section

* Update sharding to match flutter/plugins

* Remove stale exclusion

* Comment alignment, and add a placeholder for FTL

* Remove another outdated exclusion

.cirrus.yml

@@ -16,7 +16,7 @@ install_chrome_linux_template: &INSTALL_CHROME_LINUX
   install_chromium_script:
     # Install a pinned version of Chromium and its corresponding ChromeDriver.
     # Setting CHROME_EXECUTABLE above causes this version to be used for tests.
-    - ./script/install_chromium.sh "$CHROME_DIR"
+    - ./script/install_chromium.sh
 
 tool_setup_template: &TOOL_SETUP_TEMPLATE
   tool_setup_script:
@@ -224,6 +224,19 @@ task:
     memory: 16G
   matrix:
     ### Platform-agnostic tasks ###
+    - name: dart_unit_tests
+      env:
+        matrix:
+          CHANNEL: "master"
+          CHANNEL: "stable"
+      unit_test_script:
+        - ./script/tool_runner.sh test --exclude=script/configs/dart_unit_tests_exceptions.yaml
+      pathified_unit_test_script:
+        # Run tests with path-based dependencies to ensure that publishing
+        # the changes won't break tests of other packages in the repository
+        # that depend on it.
+        - ./script/tool_runner.sh make-deps-path-based --target-dependencies-with-non-breaking-updates
+        - $PLUGIN_TOOL_COMMAND test --run-on-dirty-packages --exclude=script/configs/dart_unit_tests_exceptions.yaml
     - name: linux-custom_package_tests
       env:
         PATH: $PATH:/usr/local/bin
@@ -239,19 +252,26 @@ task:
       skip: $CIRRUS_PR != '' && $CHANNEL == 'stable'
       env:
         matrix:
-          PACKAGE_SHARDING: "--shardIndex 0 --shardCount 2"
+          PACKAGE_SHARDING: "--shardIndex 0 --shardCount 5"
-          PACKAGE_SHARDING: "--shardIndex 1 --shardCount 2"
+          PACKAGE_SHARDING: "--shardIndex 1 --shardCount 5"
+          PACKAGE_SHARDING: "--shardIndex 2 --shardCount 5"
+          PACKAGE_SHARDING: "--shardIndex 3 --shardCount 5"
+          PACKAGE_SHARDING: "--shardIndex 4 --shardCount 5"
         matrix:
           CHANNEL: "master"
           CHANNEL: "stable"
       build_script:
-        # extension_google_sign_in_as_googleapis_auth is currently not building, see
+        - ./script/tool_runner.sh build-examples --apk
-        # https://github.com/flutter/flutter/issues/89301
-        - ./script/tool_runner.sh build-examples --apk --exclude=extension_google_sign_in_as_googleapis_auth
       lint_script:
         - ./script/tool_runner.sh lint-android # must come after build-examples
-      native_unit_test_scipt:
+      native_unit_test_script:
+        # Native integration tests are handled by Firebase Test Lab below, so
+        # only run unit tests.
+        # Must come after build-examples.
         - ./script/tool_runner.sh native-test --android --no-integration
+      # TODO(stuartmorgan): Copy firebase_test_lab_script from flutter/plugins
+      # once https://github.com/flutter/flutter/issues/119730 is resolved.
+      # firebase_test_lab_script:
       # Upload the full lint results to Cirrus to display in the results UI.
       always:
         android-lint_artifacts:
@@ -268,6 +288,9 @@ task:
     ### Web tasks ###
     - name: web-platform_tests
       env:
+        matrix:
+          PACKAGE_SHARDING: "--shardIndex 0 --shardCount 2"
+          PACKAGE_SHARDING: "--shardIndex 1 --shardCount 2"
         matrix:
           CHANNEL: "master"
           CHANNEL: "stable"
@@ -277,12 +300,7 @@ task:
       build_script:
         - ./script/tool_runner.sh build-examples --web
       drive_script:
-        # google_identity_services_web tests need Dart >=2.17, which is not available in stable.
+        - ./script/tool_runner.sh drive-examples --web
-        - if [[ "$CHANNEL" == "master" ]]; then
-        -   ./script/tool_runner.sh drive-examples --web
-        - else
-        -   ./script/tool_runner.sh drive-examples --web --exclude=google_identity_services_web
-        - fi
     - name: web_benchmarks_test
       env:
         matrix:
@@ -295,19 +313,6 @@ task:
         - cd ../..
         - flutter packages get
         - dart testing/web_benchmarks_test.dart
-    - name: dart_unit_tests
-      env:
-        matrix:
-          CHANNEL: "master"
-          CHANNEL: "stable"
-      unit_test_script:
-        - ./script/tool_runner.sh test --exclude=script/configs/dart_unit_tests_exceptions.yaml
-      pathified_unit_test_script:
-        # Run tests with path-based dependencies to ensure that publishing
-        # the changes won't break tests of other packages in the repository
-        # that depend on it.
-        - ./script/tool_runner.sh make-deps-path-based --target-dependencies-with-non-breaking-updates
-        - $PLUGIN_TOOL_COMMAND test --run-on-dirty-packages --exclude=script/configs/dart_unit_tests_exceptions.yaml
 
 # macOS tasks.
 task: