Add a new display_list_benchmarks test suite (#30678)

* Add a new display_list_benchmarks test suite that will allow us to microbenchmark all the rasterops defined in
our DisplayList format on both CPU and GPU canvases.

BUILD.gn

@@ -116,6 +116,7 @@ group("flutter") {
   # Compile all benchmark targets if enabled.
   if (enable_unittests && !is_win) {
     public_deps += [
+      "//flutter/display_list:display_list_benchmarks",
       "//flutter/fml:fml_benchmarks",
       "//flutter/lib/ui:ui_benchmarks",
       "//flutter/shell/common:shell_benchmarks",

ci/licenses_golden/licenses_flutter

@@ -34,6 +34,10 @@ FILE: ../../../flutter/common/task_runners.cc
 FILE: ../../../flutter/common/task_runners.h
 FILE: ../../../flutter/display_list/display_list.cc
 FILE: ../../../flutter/display_list/display_list.h
+FILE: ../../../flutter/display_list/display_list_benchmarks.cc
+FILE: ../../../flutter/display_list/display_list_benchmarks.h
+FILE: ../../../flutter/display_list/display_list_benchmarks_gl.cc
+FILE: ../../../flutter/display_list/display_list_benchmarks_metal.cc
 FILE: ../../../flutter/display_list/display_list_builder.cc
 FILE: ../../../flutter/display_list/display_list_builder.h
 FILE: ../../../flutter/display_list/display_list_canvas_dispatcher.cc

display_list/BUILD.gn

@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//flutter/testing/testing.gni")
+
 source_set("display_list") {
   sources = [
     "display_list.cc",
@@ -46,3 +48,40 @@ source_set("unittests") {
 
   public_deps = [ ":display_list" ]
 }
+
+fixtures_location("display_list_benchmarks_fixtures") {
+  assets_dir = "$target_gen_dir/"
+}
+
+if (enable_unittests) {
+  executable("display_list_benchmarks") {
+    testonly = true
+
+    sources = [
+      "display_list_benchmarks.cc",
+      "display_list_benchmarks.h",
+    ]
+
+    deps = [
+      ":display_list",
+      ":display_list_benchmarks_fixtures",
+      "//flutter/benchmarking",
+      "//flutter/common/graphics",
+      "//flutter/fml",
+      "//flutter/testing:skia",
+      "//flutter/testing:testing_lib",
+      "//third_party/dart/runtime:libdart_jit",  # for tracing
+      "//third_party/skia",
+    ]
+
+    if (!is_fuchsia) {
+      sources += [ "display_list_benchmarks_gl.cc" ]
+      deps += [ "//flutter/testing:opengl" ]
+    }
+
+    if (is_mac) {
+      sources += [ "display_list_benchmarks_metal.cc" ]
+      deps += [ "//flutter/testing:metal" ]
+    }
+  }
+}