Reverts "[Impeller] Implement draw order optimization. (#54067)" (#54136

)

Reverts: #54067
Initiated by: jonahwilliams
Reason for reverting: disappearing fabs and background color in framework golden tests https://flutter-gold.skia.org/search?issue=152354&crs=github&patchsets=2&corpus=flutter
Original PR Author: bdero

Reviewed By: {jonahwilliams}

This change reverts the following previous change:
For each clip scope, draw opaque items in reverse order and translucent/backdrop-independent items in their original order afterwards. Clips are treated as translucent by the parent scope.

Respects clips, subpass collapse, and the clear color optimization.

### Local new_gallery before/after (iPhone 12 mini):
```
cd ~/projects/flutter/flutter/dev/integration_tests/new_gallery
flutter drive --profile --local-engine-src-path ~/projects/flutter/engine/src --local-engine=ios_profile --local-engine-host=host_profile_arm64 --trace-startup -t test_driver/transitions_perf.dart -d 00008101-000A59A93C10001E
```
![image](https://github.com/user-attachments/assets/7372c128-ca71-44a6-8e6c-b0043025f751)

ci/licenses_golden/excluded_files

@@ -164,7 +164,6 @@
 ../../../flutter/impeller/entity/contents/host_buffer_unittests.cc
 ../../../flutter/impeller/entity/contents/test
 ../../../flutter/impeller/entity/contents/tiled_texture_contents_unittests.cc
-../../../flutter/impeller/entity/draw_order_resolver_unittests.cc
 ../../../flutter/impeller/entity/entity_pass_target_unittests.cc
 ../../../flutter/impeller/entity/entity_pass_unittests.cc
 ../../../flutter/impeller/entity/entity_unittests.cc

ci/licenses_golden/licenses_flutter

@@ -42130,8 +42130,6 @@ ORIGIN: ../../../flutter/impeller/entity/contents/tiled_texture_contents.cc + ..
 ORIGIN: ../../../flutter/impeller/entity/contents/tiled_texture_contents.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/contents/vertices_contents.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/contents/vertices_contents.h + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/draw_order_resolver.cc + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/draw_order_resolver.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/entity.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/entity.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/entity_pass.cc + ../../../flutter/LICENSE
@@ -45017,8 +45015,6 @@ FILE: ../../../flutter/impeller/entity/contents/tiled_texture_contents.cc
 FILE: ../../../flutter/impeller/entity/contents/tiled_texture_contents.h
 FILE: ../../../flutter/impeller/entity/contents/vertices_contents.cc
 FILE: ../../../flutter/impeller/entity/contents/vertices_contents.h
-FILE: ../../../flutter/impeller/entity/draw_order_resolver.cc
-FILE: ../../../flutter/impeller/entity/draw_order_resolver.h
 FILE: ../../../flutter/impeller/entity/entity.cc
 FILE: ../../../flutter/impeller/entity/entity.h
 FILE: ../../../flutter/impeller/entity/entity_pass.cc

impeller/entity/BUILD.gn

@@ -166,8 +166,6 @@ impeller_component("entity") {
     "contents/tiled_texture_contents.h",
     "contents/vertices_contents.cc",
     "contents/vertices_contents.h",
-    "draw_order_resolver.cc",
-    "draw_order_resolver.h",
     "entity.cc",
     "entity.h",
     "entity_pass.cc",
@@ -250,7 +248,6 @@ impeller_component("entity_unittests") {
     "contents/filters/matrix_filter_contents_unittests.cc",
     "contents/host_buffer_unittests.cc",
     "contents/tiled_texture_contents_unittests.cc",
-    "draw_order_resolver_unittests.cc",
     "entity_pass_target_unittests.cc",
     "entity_pass_unittests.cc",
     "entity_playground.cc",

impeller/entity/contents/color_source_contents.h

@@ -213,11 +213,6 @@ class ColorSourceContents : public Contents {
     pass.SetVertexBuffer(std::move(geometry_result.vertex_buffer));
     options.primitive_type = geometry_result.type;
 
-    // Enable depth writing for all opaque entities in order to allow
-    // reordering. Opaque entities are coerced to source blending by
-    // `EntityPass::AddEntity`.
-    options.depth_write_enabled = options.blend_mode == BlendMode::kSource;
-
     // Take the pre-populated vertex shader uniform struct and set managed
     // values.
     frame_info.mvp = geometry_result.transform;

impeller/entity/contents/filters/gaussian_blur_filter_contents.cc

@@ -555,16 +555,16 @@ Entity ApplyBlurStyle(FilterContents::BlurStyle blur_style,
                   const ContentContext& renderer, const Entity& entity,
                   RenderPass& pass) mutable {
                 bool result = true;
+                blur_entity.SetClipDepth(entity.GetClipDepth());
+                blur_entity.SetTransform(entity.GetTransform() *
+                                         blurred_transform);
+                result = result && blur_entity.Render(renderer, pass);
                 snapshot_entity.SetTransform(
                     entity.GetTransform() *
                     Matrix::MakeScale(1.f / source_space_scalar) *
                     snapshot_transform);
                 snapshot_entity.SetClipDepth(entity.GetClipDepth());
                 result = result && snapshot_entity.Render(renderer, pass);
-                blur_entity.SetClipDepth(entity.GetClipDepth());
-                blur_entity.SetTransform(entity.GetTransform() *
-                                         blurred_transform);
-                result = result && blur_entity.Render(renderer, pass);
                 return result;
               }),
           fml::MakeCopyable([blur_entity = blur_entity.Clone(),

impeller/entity/contents/texture_contents.cc

@@ -153,9 +153,6 @@ bool TextureContents::Render(const ContentContext& renderer,
   }
   pipeline_options.primitive_type = PrimitiveType::kTriangleStrip;
 
-  pipeline_options.depth_write_enabled =
-      stencil_enabled_ && pipeline_options.blend_mode == BlendMode::kSource;
-
   pass.SetPipeline(strict_source_rect_enabled_
                        ? renderer.GetTextureStrictSrcPipeline(pipeline_options)
                        : renderer.GetTexturePipeline(pipeline_options));