Introduce content-side Feature Policy object and maintain in parallel with renderer policy.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index d16dea8829a75df45fbc38e349fa3056b4a94a8a..12a9be7c78ef269dd6c106c1004e6895d6a23abe 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1850,6 +1850,8 @@ void RenderFrameHostImpl::OnDidChangeName(const std::string& name,
 void RenderFrameHostImpl::OnDidSetFeaturePolicyHeader(
     const ParsedFeaturePolicyHeader& parsed_header) {
   frame_tree_node()->SetFeaturePolicyHeader(parsed_header);
+  ResetFeaturePolicy();
+  feature_policy_->SetHeaderPolicy(parsed_header);
 }
 
 void RenderFrameHostImpl::OnDidAddContentSecurityPolicy(
@@ -3391,6 +3393,14 @@ void RenderFrameHostImpl::DeleteWebBluetoothService(
   web_bluetooth_services_.erase(it);
 }
 
+void RenderFrameHostImpl::ResetFeaturePolicy() {
+  RenderFrameHostImpl* parent_frame_host = GetParent();
+  const FeaturePolicy* parent_policy =
+      parent_frame_host ? parent_frame_host->get_feature_policy() : nullptr;
+  feature_policy_ = FeaturePolicy::CreateFromParentPolicy(
+      parent_policy, last_committed_origin_);
+}
+
 void RenderFrameHostImpl::Create(
     const service_manager::Identity& remote_identity,
     media::mojom::InterfaceFactoryRequest request) {