[Impeller] Disable text cache. (flutter#163906)

I forgot to make a master branch version of the cherry pick here:
flutter#163754

Author: Jonah Williams

engine/src/flutter/impeller/typographer/backends/skia/typographer_context_skia.cc

@@ -417,13 +417,20 @@ TypographerContextSkia::CollectNewGlyphs(
   size_t generation_id = atlas->GetAtlasGeneration();
   intptr_t atlas_id = reinterpret_cast<intptr_t>(atlas.get());
   for (const auto& frame : text_frames) {
+// TODO(jonahwilliams): determine how to re-enable this. See
+// https://github.com/flutter/flutter/issues/163730 for example. This can
+// happen when the Aiks/Typographer context are re-created, but the last
+// DisplayList is re-used. The "atlas_id" check is not reliable, perhaps
+// because it may end up with the same memory?
+#if false
     auto [frame_generation_id, frame_atlas_id] =
         frame->GetAtlasGenerationAndID();
     if (atlas->IsValid() && frame->IsFrameComplete() &&
         frame_generation_id == generation_id && frame_atlas_id == atlas_id &&
         !frame->GetFrameBounds(0).is_placeholder) {
       continue;
     }
+#endif  // false
     frame->ClearFrameBounds();
     frame->SetAtlasGeneration(generation_id, atlas_id);