Implement DelegationTracker for tracking delegated permissions to RenderFrameHosts

chrome/browser/permissions/permission_util.cc

Index: chrome/browser/permissions/permission_util.cc
diff --git a/chrome/browser/permissions/permission_util.cc b/chrome/browser/permissions/permission_util.cc
index 9cc8f04f717838250deacf84e8ffd4a31aa3cf8f..8749ac4adc6fda3afece2525995e52282038dbad 100644
--- a/chrome/browser/permissions/permission_util.cc
+++ b/chrome/browser/permissions/permission_util.cc
@@ -12,6 +12,11 @@
 
 using content::PermissionType;
 
+std::size_t PermissionTypeHash::operator()(
+    const content::PermissionType& type) const {
+  return static_cast<size_t>(type);
+}
+
 // The returned strings must match the RAPPOR metrics in rappor.xml,
 // and any Field Trial configs for the Permissions kill switch e.g.
 // Permissions.Action.Geolocation etc..