Workaround skia promise image release racinqg issue

Bug: 905337
Change-Id: I14e4188def4719f0b04151bf9d76731a46889612
Reviewed-on: https://chromium-review.googlesource.com/c/1351266Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612334}

components/viz/service/display/skia_renderer.cc

@@ -1153,9 +1153,12 @@ void SkiaRenderer::FinishDrawingQuadList() {
     DrawBatchedTileQuads();
   switch (draw_mode_) {
     case DrawMode::DDL: {
-      gpu::SyncToken sync_token = skia_output_surface_->SubmitPaint();
+      // Skia doesn't support releasing the last promise image ref on the DDL
+      // recordering thread. So we clear all cached promise images before
+      // SubmitPaint to the GPU thread.
       promise_images_.clear();
       yuv_promise_images_.clear();
+      gpu::SyncToken sync_token = skia_output_surface_->SubmitPaint();
       lock_set_for_external_use_.UnlockResources(sync_token);
       break;
     }