[Impeller] delete specific vertices shader. (#52360)

Once #52348 and #52345 land we can delete this shader

Part of flutter/flutter#143540

Author: Jonah Williams

ci/licenses_golden/licenses_flutter

@@ -40501,7 +40501,6 @@ ORIGIN: ../../../flutter/impeller/entity/shaders/gradients/radial_gradient_fill.
 ORIGIN: ../../../flutter/impeller/entity/shaders/gradients/radial_gradient_ssbo_fill.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/gradients/sweep_gradient_fill.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/gradients/sweep_gradient_ssbo_fill.frag + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/position_color.vert + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/rrect_blur.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/rrect_blur.vert + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/runtime_effect.vert + ../../../flutter/LICENSE
@@ -40513,7 +40512,6 @@ ORIGIN: ../../../flutter/impeller/entity/shaders/texture_fill_strict_src.frag +
 ORIGIN: ../../../flutter/impeller/entity/shaders/texture_uv_fill.vert + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/tiled_texture_fill.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/entity/shaders/tiled_texture_fill_external.frag + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/entity/shaders/vertices.frag + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/geometry/color.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/geometry/color.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/geometry/constants.cc + ../../../flutter/LICENSE
@@ -43379,7 +43377,6 @@ FILE: ../../../flutter/impeller/entity/shaders/gradients/radial_gradient_fill.fr
 FILE: ../../../flutter/impeller/entity/shaders/gradients/radial_gradient_ssbo_fill.frag
 FILE: ../../../flutter/impeller/entity/shaders/gradients/sweep_gradient_fill.frag
 FILE: ../../../flutter/impeller/entity/shaders/gradients/sweep_gradient_ssbo_fill.frag
-FILE: ../../../flutter/impeller/entity/shaders/position_color.vert
 FILE: ../../../flutter/impeller/entity/shaders/rrect_blur.frag
 FILE: ../../../flutter/impeller/entity/shaders/rrect_blur.vert
 FILE: ../../../flutter/impeller/entity/shaders/runtime_effect.vert
@@ -43391,7 +43388,6 @@ FILE: ../../../flutter/impeller/entity/shaders/texture_fill_strict_src.frag
 FILE: ../../../flutter/impeller/entity/shaders/texture_uv_fill.vert
 FILE: ../../../flutter/impeller/entity/shaders/tiled_texture_fill.frag
 FILE: ../../../flutter/impeller/entity/shaders/tiled_texture_fill_external.frag
-FILE: ../../../flutter/impeller/entity/shaders/vertices.frag
 FILE: ../../../flutter/impeller/geometry/color.cc
 FILE: ../../../flutter/impeller/geometry/color.h
 FILE: ../../../flutter/impeller/geometry/constants.cc

impeller/entity/BUILD.gn

@@ -24,7 +24,6 @@ impeller_shaders("entity_shaders") {
     "shaders/glyph_atlas.vert",
     "shaders/gradients/gradient_fill.vert",
     "shaders/gradients/linear_gradient_fill.frag",
-    "shaders/position_color.vert",
     "shaders/gradients/radial_gradient_fill.frag",
     "shaders/rrect_blur.vert",
     "shaders/rrect_blur.frag",
@@ -38,7 +37,6 @@ impeller_shaders("entity_shaders") {
     "shaders/tiled_texture_fill.frag",
     "shaders/tiled_texture_fill_external.frag",
     "shaders/texture_fill_strict_src.frag",
-    "shaders/vertices.frag",
     "shaders/blending/porter_duff_blend.frag",
     "shaders/blending/porter_duff_blend.vert",
     "shaders/filters/border_mask_blur.frag",

impeller/entity/contents/content_context.cc

@@ -439,7 +439,6 @@ ContentContext::ContentContext(
           GetContext()->GetCapabilities()->GetDefaultGlyphAtlasFormat() ==
           PixelFormat::kA8UNormInt)});
   glyph_atlas_color_pipelines_.CreateDefault(*context_, options);
-  geometry_color_pipelines_.CreateDefault(*context_, options);
   yuv_to_rgb_filter_pipelines_.CreateDefault(*context_, options_trianglestrip);
   porter_duff_blend_pipelines_.CreateDefault(*context_, options_trianglestrip,
                                              {supports_decal});

impeller/entity/contents/content_context.h

@@ -46,7 +46,6 @@
 #include "impeller/entity/morphology_filter.frag.h"
 #include "impeller/entity/porter_duff_blend.frag.h"
 #include "impeller/entity/porter_duff_blend.vert.h"
-#include "impeller/entity/position_color.vert.h"
 #include "impeller/entity/radial_gradient_fill.frag.h"
 #include "impeller/entity/rrect_blur.frag.h"
 #include "impeller/entity/rrect_blur.vert.h"
@@ -59,7 +58,6 @@
 #include "impeller/entity/texture_fill_strict_src.frag.h"
 #include "impeller/entity/texture_uv_fill.vert.h"
 #include "impeller/entity/tiled_texture_fill.frag.h"
-#include "impeller/entity/vertices.frag.h"
 #include "impeller/entity/yuv_to_rgb_filter.frag.h"
 
 #include "impeller/typographer/glyph_atlas.h"
@@ -158,9 +156,6 @@ using PorterDuffBlendPipeline =
                          PorterDuffBlendFragmentShader>;
 using ClipPipeline = RenderPipelineHandle<ClipVertexShader, ClipFragmentShader>;
 
-using GeometryColorPipeline =
-    RenderPipelineHandle<PositionColorVertexShader, VerticesFragmentShader>;
-
 // Advanced blends
 using BlendColorPipeline = RenderPipelineHandle<AdvancedBlendVertexShader,
                                                 AdvancedBlendFragmentShader>;
@@ -526,11 +521,6 @@ class ContentContext {
     return GetPipeline(glyph_atlas_color_pipelines_, opts);
   }
 
-  std::shared_ptr<Pipeline<PipelineDescriptor>> GetGeometryColorPipeline(
-      ContentContextOptions opts) const {
-    return GetPipeline(geometry_color_pipelines_, opts);
-  }
-
   std::shared_ptr<Pipeline<PipelineDescriptor>> GetYUVToRGBFilterPipeline(
       ContentContextOptions opts) const {
     return GetPipeline(yuv_to_rgb_filter_pipelines_, opts);
@@ -928,7 +918,6 @@ class ContentContext {
   mutable Variants<ClipPipeline> clip_pipelines_;
   mutable Variants<GlyphAtlasPipeline> glyph_atlas_pipelines_;
   mutable Variants<GlyphAtlasColorPipeline> glyph_atlas_color_pipelines_;
-  mutable Variants<GeometryColorPipeline> geometry_color_pipelines_;
   mutable Variants<YUVToRGBFilterPipeline> yuv_to_rgb_filter_pipelines_;
   mutable Variants<PorterDuffBlendPipeline> porter_duff_blend_pipelines_;
   // Advanced blends.