Implement a DisplayList mechanism similar to the Skia SkLiteDL mechanism (flutter#26928)

Author: flar

ci/licenses_golden/licenses_flutter

@@ -36,6 +36,14 @@ FILE: ../../../flutter/flow/compositor_context.cc
 FILE: ../../../flutter/flow/compositor_context.h
 FILE: ../../../flutter/flow/diff_context.cc
 FILE: ../../../flutter/flow/diff_context.h
+FILE: ../../../flutter/flow/display_list.cc
+FILE: ../../../flutter/flow/display_list.h
+FILE: ../../../flutter/flow/display_list_canvas.cc
+FILE: ../../../flutter/flow/display_list_canvas.h
+FILE: ../../../flutter/flow/display_list_canvas_unittests.cc
+FILE: ../../../flutter/flow/display_list_unittests.cc
+FILE: ../../../flutter/flow/display_list_utils.cc
+FILE: ../../../flutter/flow/display_list_utils.h
 FILE: ../../../flutter/flow/embedded_view_params_unittests.cc
 FILE: ../../../flutter/flow/embedded_views.cc
 FILE: ../../../flutter/flow/embedded_views.h
@@ -67,6 +75,9 @@ FILE: ../../../flutter/flow/layers/color_filter_layer_unittests.cc
 FILE: ../../../flutter/flow/layers/container_layer.cc
 FILE: ../../../flutter/flow/layers/container_layer.h
 FILE: ../../../flutter/flow/layers/container_layer_unittests.cc
+FILE: ../../../flutter/flow/layers/display_list_layer.cc
+FILE: ../../../flutter/flow/layers/display_list_layer.h
+FILE: ../../../flutter/flow/layers/display_list_layer_unittests.cc
 FILE: ../../../flutter/flow/layers/image_filter_layer.cc
 FILE: ../../../flutter/flow/layers/image_filter_layer.h
 FILE: ../../../flutter/flow/layers/image_filter_layer_unittests.cc

common/settings.h

@@ -163,6 +163,9 @@ struct Settings {
   // Selects the SkParagraph implementation of the text layout engine.
   bool enable_skparagraph = false;
 
+  // Selects the DisplayList for storage of rendering operations.
+  bool enable_display_list = false;
+
   // All shells in the process share the same VM. The last shell to shutdown
   // should typically shut down the VM as well. However, applications depend on
   // the behavior of "warming-up" the VM by creating a shell that does not do

flow/BUILD.gn

@@ -12,6 +12,12 @@ source_set("flow") {
     "compositor_context.h",
     "diff_context.cc",
     "diff_context.h",
+    "display_list.cc",
+    "display_list.h",
+    "display_list_canvas.cc",
+    "display_list_canvas.h",
+    "display_list_utils.cc",
+    "display_list_utils.h",
     "embedded_views.cc",
     "embedded_views.h",
     "frame_timings.cc",
@@ -30,6 +36,8 @@ source_set("flow") {
     "layers/color_filter_layer.h",
     "layers/container_layer.cc",
     "layers/container_layer.h",
+    "layers/display_list_layer.cc",
+    "layers/display_list_layer.h",
     "layers/image_filter_layer.cc",
     "layers/image_filter_layer.h",
     "layers/layer.cc",
@@ -123,6 +131,8 @@ if (enable_unittests) {
     testonly = true
 
     sources = [
+      "display_list_canvas_unittests.cc",
+      "display_list_unittests.cc",
       "embedded_view_params_unittests.cc",
       "flow_run_all_unittests.cc",
       "flow_test_utils.cc",
@@ -136,6 +146,7 @@ if (enable_unittests) {
       "layers/clip_rrect_layer_unittests.cc",
       "layers/color_filter_layer_unittests.cc",
       "layers/container_layer_unittests.cc",
+      "layers/display_list_layer_unittests.cc",
       "layers/image_filter_layer_unittests.cc",
       "layers/layer_tree_unittests.cc",
       "layers/opacity_layer_unittests.cc",