[Impeller] testing.

Author: jonahwilliams

impeller/aiks/picture.cc

@@ -67,7 +67,8 @@ std::shared_ptr<Texture> Picture::RenderToTexture(
         "Picture Snapshot MSAA",  // label
         RenderTarget::
             kDefaultColorAttachmentConfigMSAA,  // color_attachment_config
-        std::nullopt                            // stencil_attachment_config
+        RenderTarget::
+            kDefaultStencilAttachmentConfig  // stencil_attachment_config
     );
   } else {
     target = render_target_allocator.CreateOffscreen(
@@ -76,7 +77,8 @@ std::shared_ptr<Texture> Picture::RenderToTexture(
         /*mip_count=*/1,
         "Picture Snapshot",                           // label
         RenderTarget::kDefaultColorAttachmentConfig,  // color_attachment_config
-        std::nullopt  // stencil_attachment_config
+        RenderTarget::
+            kDefaultStencilAttachmentConfig  // stencil_attachment_config
     );
   }
   if (!target.IsValid()) {

impeller/entity/contents/content_context.h

@@ -408,7 +408,7 @@ class ContentContext {
   ///
   // TODO(bdero): Remove this setting once StC is fully de-risked
   //              https://github.com/flutter/flutter/issues/123671
-  static constexpr bool kEnableStencilThenCover = false;
+  static constexpr bool kEnableStencilThenCover = true;
 
 #if IMPELLER_ENABLE_3D
   std::shared_ptr<scene::SceneContext> GetSceneContext() const;