[ci] Add emulator tests on older Android version

.ci.yaml

@@ -29,6 +29,18 @@ platform_properties:
           {"dependency": "open_jdk", "version": "version:17"},
           {"dependency": "curl", "version": "version:7.64.0"}
         ]
+  linux_android_legacy:
+    properties:
+      os: Ubuntu
+      cores: "8"
+      device_type: none
+      dependencies: >-
+        [
+          {"dependency": "android_sdk", "version": "version:33v6"},
+          {"dependency": "open_jdk", "version": "version:17"},
+          {"dependency": "curl", "version": "version:7.64.0"},
+          {"dependency": "android_virtual_device", "version": "22"}
+        ]
   linux_desktop:
     properties:
       os: Ubuntu
@@ -529,6 +541,66 @@ targets:
           {"dependency": "android_virtual_device", "version": "33"}
         ]
 
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_1 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 0 --shardCount 6"
+
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_2 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 1 --shardCount 6"
+
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_3 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 2 --shardCount 6"
+
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_4 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 3 --shardCount 6"
+
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_5 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 4 --shardCount 6"
+
+  - name: linux_android_legacy android_platform_tests_legacy_api_shard_6 master
+    recipe: packages/packages
+    timeout: 60
+    bringup: true # New target
+    properties:
+      target_file: android_legacy_emulator_tests.yaml
+      channel: master
+      version_file: flutter_master.version
+      package_sharding: "--shardIndex 5 --shardCount 6"
+
   # Device versions of Android integration tests, run via FTL.
   # TODO(stuartmorgan): Revisit whether physical device tests are redundant once
   # we have more data about emulator tests; see

.ci/targets/android_legacy_emulator_tests.yaml

@@ -0,0 +1,16 @@
+tasks:
+  - name: prepare tool
+    script: .ci/scripts/prepare_tool.sh
+    infra_step: true # Note infra steps failing prevents "always" from running.
+  - name: download Dart and Android deps
+    script: script/tool_runner.sh
+    infra_step: true
+    args: ["fetch-deps", "--android", "--supporting-target-platforms-only", "--exclude=script/configs/exclude_integration_android_legacy_emulator.yaml"]
+  # Only these two tests are run because they are the only ones that use the
+  # emulator. Other tests would just duplicate android_platform_test.yaml tests.
+  - name: native integration tests
+    script: script/tool_runner.sh
+    args: ["native-test", "--android", "--no-unit", "--exclude=script/configs/exclude_integration_android_legacy_emulator.yaml"]
+  - name: drive examples
+    script: script/tool_runner.sh
+    args: ["drive-examples", "--android", "--exclude=script/configs/exclude_integration_android_legacy_emulator.yaml,script/configs/exclude_integration_android.yaml,script/configs/exclude_integration_android_emulator.yaml"]

script/configs/exclude_integration_android_legacy_emulator.yaml

@@ -0,0 +1,13 @@
+# This plugin no-ops below API 25, which is newer than the legacy emulator.
+# This can be removed once the legacy emulator test is using at least
+# API level 25.
+- quick_actions
+- quick_actions_android
+# Fails on the legacy emulator. See https://github.com/flutter/flutter/issues/136823
+# TODO(stuartmorgan): Remove this if the limitation can be worked around.
+- video_player
+- video_player_android
+# Hangs on the legacy emulator. See https://github.com/flutter/flutter/issues/136824
+# TODO(stuartmorgan): Remove this if the hang can be fixed.
+- webview_flutter
+- webview_flutter_android