Create v2 configuration for emulator tests. (flutter/engine#42652)

Migrates emulator tests to engine v2.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

engine/src/flutter/.ci.yaml

@@ -102,6 +102,16 @@ targets:
       android_sdk_preview_license: \n84831b9409646a918e30573bab4c9c91346d8abd
     timeout: 60
 
+  - name: Linux linux_android_emulator_tests
+    bringup: true
+    enabled_branches:
+      - main
+    recipe: engine_v2/builder
+    presubmit: false
+    properties:
+      config_name: linux_android_emulator
+    timeout: 60
+
   - name: Linux Android Emulator Tests
     recipe: engine/scenarios
     enabled_branches:

engine/src/flutter/ci/builders/standalone/linux_android_emulator.json

@@ -0,0 +1,46 @@
+{
+    "drone_dimensions": [
+        "device_type=none",
+        "os=Linux"
+    ],
+    "gn": [
+         "--android",
+         "--android-cpu=x64",
+         "--no-lto"
+    ],
+    "name": "android_debug_x64",
+    "ninja": {
+        "config": "android_debug_x64",
+        "targets": [
+            "flutter/shell/platform/android:flutter_shell_native_unittests",
+            "flutter/testing/scenario_app"
+        ]
+    },
+    "tests": [
+        {
+            "language": "python3",
+            "name": "Android Unit Tests",
+            "contexts": [
+                "android_virtual_device"
+            ],
+	    "parameters": [
+                "--android-variant",
+                "android_debug_x64",
+                "--type",
+                "android"
+	    ],
+            "script": "flutter/testing/run_tests.py"
+        },
+        {
+            "language": "bash",
+            "name": "Scenario App Integration Tests",
+            "contexts": [
+                "android_virtual_device"
+            ],
+	    "parameters": [
+                "android_debug_x64"
+	    ],
+            "script": "flutter/testing/scenario_app/run_android_tests.sh"
+        }
+    ]
+}