[Impeller] enable Impeller by default on Android. (#53099)

All plugin migrations have landed. Enable impeller by default on Android.

Author: Jonah Williams

common/settings.h

@@ -223,7 +223,7 @@ struct Settings {
 
   // Enable the Impeller renderer on supported platforms. Ignored if Impeller is
   // not supported on the platform.
-#if FML_OS_IOS || FML_OS_IOS_SIMULATOR
+#if FML_OS_IOS || FML_OS_IOS_SIMULATOR || FML_OS_ANDROID
   bool enable_impeller = true;
 #else
   bool enable_impeller = false;

shell/platform/android/io/flutter/embedding/engine/FlutterShellArgs.java

@@ -45,7 +45,7 @@ public class FlutterShellArgs {
   public static final String ARG_KEY_TRACE_TO_FILE = "trace-to-file";
   public static final String ARG_TRACE_TO_FILE = "--trace-to-file";
   public static final String ARG_KEY_ENABLE_IMPELLER = "enable-impeller";
-  public static final String ARG_ENABLE_IMPELLER = "--enable-impeller";
+  public static final String ARG_DISABLE_IMPELLER = "--enable-impeller=false";
   public static final String ARG_KEY_ENABLE_VULKAN_VALIDATION = "enable-vulkan-validation";
   public static final String ARG_ENABLE_VULKAN_VALIDATION = "--enable-vulkan-validation";
   public static final String ARG_KEY_DUMP_SHADER_SKP_ON_SHADER_COMPILATION =
@@ -123,8 +123,8 @@ public static FlutterShellArgs fromIntent(@NonNull Intent intent) {
     if (intent.hasExtra(ARG_KEY_TRACE_TO_FILE)) {
       args.add(ARG_TRACE_TO_FILE + "=" + intent.getStringExtra(ARG_KEY_TRACE_TO_FILE));
     }
-    if (intent.getBooleanExtra(ARG_KEY_ENABLE_IMPELLER, false)) {
-      args.add(ARG_ENABLE_IMPELLER);
+    if (!intent.getBooleanExtra(ARG_KEY_ENABLE_IMPELLER, true)) {
+      args.add(ARG_DISABLE_IMPELLER);
     }
     if (intent.getBooleanExtra(ARG_KEY_ENABLE_VULKAN_VALIDATION, false)) {
       args.add(ARG_ENABLE_VULKAN_VALIDATION);

testing/scenario_app/android/app/src/androidTest/java/dev/flutter/TestRunner.java

@@ -23,6 +23,8 @@ public void onCreate(@Nullable Bundle arguments) {
             "--enable-impeller=true",
             "--impeller-backend=" + arguments.getString("impeller-backend", "vulkan")
           };
+    } else {
+      engineArguments = new String[]{"--enable-impeller=false"};
     }
     FlutterRenderer.debugDisableSurfaceClear = true;
     if ("true".equals(arguments.getString("force-surface-producer-surface-texture"))) {

testing/scenario_app/bin/run_android_tests.dart

@@ -417,7 +417,9 @@ Future<void> _run({
         if (smokeTestFullPath != null)
           '-e class $smokeTestFullPath',
         if (enableImpeller)
-          '-e enable-impeller true',
+          '-e enable-impeller true'
+        else
+          '-e enable-impeller false',
         if (impellerBackend != null)
           '-e impeller-backend ${impellerBackend.name}',
         if (forceSurfaceProducerSurfaceTexture)