Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

chrome/browser/permissions/permission_util.h

Index: chrome/browser/permissions/permission_util.h
diff --git a/chrome/browser/permissions/permission_util.h b/chrome/browser/permissions/permission_util.h
index dcc9095c4b7eb51c73ab694fd76d961d4d93e23b..9a43d1f2322b4c3173d0f81fba6afc73e6661494 100644
--- a/chrome/browser/permissions/permission_util.h
+++ b/chrome/browser/permissions/permission_util.h
@@ -18,6 +18,10 @@ namespace content {
 enum class PermissionType;
 }  // namespace content
 
+struct PermissionTypeHash {
+  std::size_t operator()(const content::PermissionType& type) const;
+};
+
 // A utility class for permissions.
 class PermissionUtil {
  public: