[Impeller] Reorder pipeline construction in content context. (#54373)

Fixes the regression to the first-frame time on the Mokey.

Also add a trace that should allow for easier identification of problematic pipelines.

A more involved job-queue that allows construction jobs to skip the queue was written in #54355. But the Mokey case is not important enough for the additional complexity. See the context in the linked patch.

<img width="2137" alt="Screenshot 2024-08-06 at 1 20 26�PM" src="https://github.com/user-attachments/assets/aed671c1-b7f7-4c9f-8553-485f8c0dd35e">

[start_up_timeline.json.zip](https://github.com/user-attachments/files/16515389/start_up_timeline.json.zip)

Author: chinmaygarde

impeller/entity/contents/content_context.cc

@@ -292,7 +292,15 @@ ContentContext::ContentContext(
   const auto supports_decal = static_cast<Scalar>(
       context_->GetCapabilities()->SupportsDecalSamplerAddressMode());
 
+  // Futures for the following pipelines may block in case the first frame is
+  // rendered without the pipelines being ready. Put pipelines that are more
+  // likely to be used first.
   {
+    glyph_atlas_pipelines_.CreateDefault(
+        *context_, options,
+        {static_cast<Scalar>(
+            GetContext()->GetCapabilities()->GetDefaultGlyphAtlasFormat() ==
+            PixelFormat::kA8UNormInt)});
     solid_fill_pipelines_.CreateDefault(*context_, options);
     texture_pipelines_.CreateDefault(*context_, options);
     fast_gradient_pipelines_.CreateDefault(*context_, options);
@@ -310,7 +318,6 @@ ContentContext::ContentContext(
     }
 
     /// Setup default clip pipeline.
-
     auto clip_pipeline_descriptor =
         ClipPipeline::Builder::MakeDefaultPipelineDescriptor(*context_);
     if (!clip_pipeline_descriptor.has_value()) {
@@ -332,6 +339,20 @@ ContentContext::ContentContext(
     clip_pipelines_.SetDefault(
         options,
         std::make_unique<ClipPipeline>(*context_, clip_pipeline_descriptor));
+    texture_downsample_pipelines_.CreateDefault(*context_,
+                                                options_trianglestrip);
+    rrect_blur_pipelines_.CreateDefault(*context_, options_trianglestrip);
+    texture_strict_src_pipelines_.CreateDefault(*context_, options);
+    tiled_texture_pipelines_.CreateDefault(*context_, options,
+                                           {supports_decal});
+    gaussian_blur_pipelines_.CreateDefault(*context_, options_trianglestrip,
+                                           {supports_decal});
+    border_mask_blur_pipelines_.CreateDefault(*context_, options_trianglestrip);
+    color_matrix_color_filter_pipelines_.CreateDefault(*context_,
+                                                       options_trianglestrip);
+    porter_duff_blend_pipelines_.CreateDefault(*context_, options_trianglestrip,
+                                               {supports_decal});
+    vertices_uber_shader_.CreateDefault(*context_, options, {supports_decal});
   }
 
   if (context_->GetCapabilities()->SupportsFramebufferFetch()) {
@@ -428,30 +449,14 @@ ContentContext::ContentContext(
         {static_cast<Scalar>(BlendSelectValues::kSoftLight), supports_decal});
   }
 
-  texture_downsample_pipelines_.CreateDefault(*context_, options_trianglestrip);
-  rrect_blur_pipelines_.CreateDefault(*context_, options_trianglestrip);
-  texture_strict_src_pipelines_.CreateDefault(*context_, options);
-  tiled_texture_pipelines_.CreateDefault(*context_, options, {supports_decal});
-  gaussian_blur_pipelines_.CreateDefault(*context_, options_trianglestrip,
-                                         {supports_decal});
-  border_mask_blur_pipelines_.CreateDefault(*context_, options_trianglestrip);
   morphology_filter_pipelines_.CreateDefault(*context_, options_trianglestrip,
                                              {supports_decal});
-  color_matrix_color_filter_pipelines_.CreateDefault(*context_,
-                                                     options_trianglestrip);
   linear_to_srgb_filter_pipelines_.CreateDefault(*context_,
                                                  options_trianglestrip);
   srgb_to_linear_filter_pipelines_.CreateDefault(*context_,
                                                  options_trianglestrip);
-  glyph_atlas_pipelines_.CreateDefault(
-      *context_, options,
-      {static_cast<Scalar>(
-          GetContext()->GetCapabilities()->GetDefaultGlyphAtlasFormat() ==
-          PixelFormat::kA8UNormInt)});
   yuv_to_rgb_filter_pipelines_.CreateDefault(*context_, options_trianglestrip);
-  porter_duff_blend_pipelines_.CreateDefault(*context_, options_trianglestrip,
-                                             {supports_decal});
-  vertices_uber_shader_.CreateDefault(*context_, options, {supports_decal});
+
   // GLES only shader that is unsupported on macOS.
 #if defined(IMPELLER_ENABLE_OPENGLES) && !defined(FML_OS_MACOSX)
   if (GetContext()->GetBackendType() == Context::BackendType::kOpenGLES) {

impeller/renderer/backend/vulkan/pipeline_vk.cc

@@ -451,7 +451,8 @@ std::unique_ptr<PipelineVK> PipelineVK::Create(
     const std::shared_ptr<DeviceHolderVK>& device_holder,
     const std::weak_ptr<PipelineLibrary>& weak_library,
     std::shared_ptr<SamplerVK> immutable_sampler) {
-  TRACE_EVENT0("flutter", "PipelineVK::Create");
+  TRACE_EVENT1("flutter", "PipelineVK::Create", "Name",
+               desc.GetLabel().c_str());
 
   auto library = weak_library.lock();