Add flag --use-skia-deferred-display-list

Also pass the flag to viz via RendererSettings.

This CL is part of CL https://crrev.com/c/947047 which makes
SkiaRenderer use Skia DDL to render frames.

Bug: 824382
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I1d9487afd4fd15925acad234916ebedf6292e7bb
Reviewed-on: https://chromium-review.googlesource.com/973802
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544887}

components/viz/common/display/renderer_settings.h

@@ -29,6 +29,7 @@ class VIZ_COMMON_EXPORT RendererSettings {
   bool show_overdraw_feedback = false;
   bool enable_draw_occlusion = false;
   bool use_skia_renderer = false;
+  bool use_skia_deferred_display_list = false;
   bool allow_overlays = true;
   bool dont_round_texture_sizes_for_pixel_tests = false;
   int highp_threshold_min = 0;

components/viz/host/renderer_settings_creation.cc

@@ -59,6 +59,8 @@ RendererSettings CreateRendererSettings() {
       !command_line->HasSwitch(switches::kDisableCompositedAntialiasing);
   renderer_settings.use_skia_renderer =
       command_line->HasSwitch(switches::kUseSkiaRenderer);
+  renderer_settings.use_skia_deferred_display_list =
+      command_line->HasSwitch(switches::kUseSkiaDeferredDisplayList);
 #if defined(OS_MACOSX)
   renderer_settings.allow_overlays =
       ui::RemoteLayerAPISupported() &&

services/viz/privileged/interfaces/compositing/renderer_settings.mojom

@@ -18,5 +18,6 @@ struct RendererSettings {
   bool enable_draw_occlusion;
   int32 slow_down_compositing_scale_factor;
   bool use_skia_renderer;
+  bool use_skia_deferred_display_list;
   bool allow_overlays;
 };

services/viz/privileged/interfaces/compositing/renderer_settings_struct_traits.cc

@@ -26,6 +26,7 @@ bool StructTraits<viz::mojom::RendererSettingsDataView, viz::RendererSettings>::
   out->slow_down_compositing_scale_factor =
       data.slow_down_compositing_scale_factor();
   out->use_skia_renderer = data.use_skia_renderer();
+  out->use_skia_deferred_display_list = data.use_skia_deferred_display_list();
   out->allow_overlays = data.allow_overlays();
   return true;
 }

services/viz/privileged/interfaces/compositing/renderer_settings_struct_traits.h

@@ -67,6 +67,11 @@ struct StructTraits<viz::mojom::RendererSettingsDataView,
     return input.use_skia_renderer;
   }
 
+  static bool use_skia_deferred_display_list(
+      const viz::RendererSettings& input) {
+    return input.use_skia_deferred_display_list;
+  }
+
   static bool allow_overlays(const viz::RendererSettings& input) {
     return input.allow_overlays;
   }

ui/base/ui_base_switches.cc

@@ -100,6 +100,11 @@ const char kUIDisablePartialSwap[] = "ui-disable-partial-swap";
 // Red: Overdrawn four or more times.
 const char kShowOverdrawFeedback[] = "show-overdraw-feedback";
 
+// Use Skia Deferred Display List, with this option, SkiaRenderer will record
+// frames to Skia DDLs and play them back on the GPU thread. This flag is only
+// be effective with --use-skia-renderer.
+const char kUseSkiaDeferredDisplayList[] = "use-skia-deferred-display-list";
+
 // Use SkiaRenderer instead of GLRenderer for direct rendering.
 const char kUseSkiaRenderer[] = "use-skia-renderer";
 

ui/base/ui_base_switches.h

@@ -41,6 +41,7 @@ UI_BASE_EXPORT extern const char kTopChromeMDMaterialHybrid[];
 UI_BASE_EXPORT extern const char kTopChromeMDMaterialTouchOptimized[];
 UI_BASE_EXPORT extern const char kTopChromeMDMaterialRefresh[];
 UI_BASE_EXPORT extern const char kUIDisablePartialSwap[];
+UI_BASE_EXPORT extern const char kUseSkiaDeferredDisplayList[];
 UI_BASE_EXPORT extern const char kUseSkiaRenderer[];
 
 // Test related.