Add backdrop-filter to cc::EffectNode::ToString()

Change-Id: Ic629921bdc6280c19a9c2d0962bbfa37faba70fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670117
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672135}

cc/trees/effect_node.cc

@@ -146,6 +146,9 @@ void EffectNode::AsValueInto(base::trace_event::TracedValue* value) const {
   value->SetInteger("parent_id", parent_id);
   value->SetInteger("stable_id", stable_id);
   value->SetDouble("opacity", opacity);
+  if (!backdrop_filters.IsEmpty()) {
+    value->SetString("backdrop_filters", backdrop_filters.ToString());
+  }
   value->SetDouble("backdrop_filter_quality", backdrop_filter_quality);
   value->SetBoolean("is_fast_rounded_corner", is_fast_rounded_corner);
   if (!rounded_corner_bounds.IsEmpty()) {