[Impeller] treat glyph atlas texture as source of truth, remove copy of SkBitmap.

ci/licenses_golden/licenses_flutter

@@ -40911,8 +40911,6 @@ ORIGIN: ../../../flutter/impeller/toolkit/egl/surface.cc + ../../../flutter/LICE
 ORIGIN: ../../../flutter/impeller/toolkit/egl/surface.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/toolkit/gles/gles.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/toolkit/gles/texture.h + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.cc + ../../../flutter/LICENSE
-ORIGIN: ../../../flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/impeller/typographer/backends/skia/typeface_skia.cc + ../../../flutter/LICENSE
@@ -43793,8 +43791,6 @@ FILE: ../../../flutter/impeller/toolkit/gles/gles.h
 FILE: ../../../flutter/impeller/toolkit/gles/texture.cc
 FILE: ../../../flutter/impeller/toolkit/gles/texture.h
 FILE: ../../../flutter/impeller/tools/malioc.json
-FILE: ../../../flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.cc
-FILE: ../../../flutter/impeller/typographer/backends/skia/glyph_atlas_context_skia.h
 FILE: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.cc
 FILE: ../../../flutter/impeller/typographer/backends/skia/text_frame_skia.h
 FILE: ../../../flutter/impeller/typographer/backends/skia/typeface_skia.cc

impeller/entity/contents/text_contents.cc

@@ -73,7 +73,7 @@ bool TextContents::Render(const ContentContext& renderer,
   auto type = frame_->GetAtlasType();
   const std::shared_ptr<GlyphAtlas>& atlas =
       renderer.GetLazyGlyphAtlas()->CreateOrGetGlyphAtlas(
-          *renderer.GetContext(), type);
+          *renderer.GetContext(), renderer.GetTransientsBuffer(), type);
 
   if (!atlas || !atlas->IsValid()) {
     VALIDATION_LOG << "Cannot render glyphs without prepared atlas.";

impeller/renderer/blit_pass.cc

@@ -142,11 +142,12 @@ bool BlitPass::AddCopy(BufferView source,
 
   auto bytes_per_pixel =
       BytesPerPixelForPixelFormat(destination->GetTextureDescriptor().format);
-  auto bytes_per_image = destination_region_value.Area() * bytes_per_pixel;
+  auto bytes_per_region = destination_region_value.Area() * bytes_per_pixel;
 
-  if (source.range.length != bytes_per_image) {
+  if (source.range.length != bytes_per_region) {
     VALIDATION_LOG
-        << "Attempted to add a texture blit with out of bounds access.";
+        << "Attempted to add a texture blit with out of bounds access."
+        << source.range.length << " " << bytes_per_region;
     return false;
   }
   if (slice > 5) {

impeller/typographer/backends/skia/BUILD.gn

@@ -6,8 +6,6 @@ import("//flutter/impeller/tools/impeller.gni")
 
 impeller_component("typographer_skia_backend") {
   sources = [
-    "glyph_atlas_context_skia.cc",
-    "glyph_atlas_context_skia.h",
     "text_frame_skia.cc",
     "text_frame_skia.h",
     "typeface_skia.cc",