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Example config in "document_policy_features.cc":
    {
      name: "DefaultValueFeatureForTest",
      document_policy_name: "_reserved",
      value_type: "Bool",
      default_value: "true",
      depends_on: [],
      default_value_behind_flag: [
        ["PaintHolding", "false"],
        ["ScriptStreaming", "true"],
      ]
    },

Generated output:
const DocumentPolicyFeatureInfoMap& GetDocumentPolicyFeatureInfoMap() {
  static const base::NoDestructor<DocumentPolicyFeatureInfoMap> feature_info_map([] {
    DocumentPolicyFeatureInfoMap map({        {
          mojom::DocumentPolicyFeature::kDefaultValueFeatureForTest,
          {
            "",
            PolicyValue::CreateBool(true)
          }
        }, ...});

        if (base::FeatureList::IsEnabled(features::kPaintHolding)) {
          map.insert_or_assign(
            mojom::DocumentPolicyFeature::kDefaultValueFeatureForTest,
            DocumentPolicyFeatureInfo {
              "",
              PolicyValue::CreateBool(false)
            }
          );
        } else if (base::FeatureList::IsEnabled(features::kScriptStreaming)) {
          map.insert_or_assign(
            mojom::DocumentPolicyFeature::kDefaultValueFeatureForTest,
            DocumentPolicyFeatureInfo {
              "",
              PolicyValue::CreateBool(true)
            }
          );
        }
    return map;
  }());
  return *feature_info_map;
}

Bug: 1166698
Change-Id: Ib0bf5905ddcccface2673486181616662c6e2b7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534612
Commit-Queue: Charlie Hu <chenleihu@google.com>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843716}