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

content/browser/frame_host/frame_tree_node.cc

Index: content/browser/frame_host/frame_tree_node.cc
diff --git a/content/browser/frame_host/frame_tree_node.cc b/content/browser/frame_host/frame_tree_node.cc
index 490317f4b9cfa4b8b123f0a77f6dedce15ab3d39..6733f0c20c068f0dcd4e09c6600aed9711895aeb 100644
--- a/content/browser/frame_host/frame_tree_node.cc
+++ b/content/browser/frame_host/frame_tree_node.cc
@@ -18,6 +18,7 @@
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/common/feature_policy/feature_policy.h"
 #include "content/common/frame_messages.h"
 #include "content/common/site_isolation_policy.h"
 #include "content/public/browser/browser_thread.h"
@@ -259,11 +260,17 @@ void FrameTreeNode::SetFrameName(const std::string& name,
 
 void FrameTreeNode::SetFeaturePolicyHeader(
     const ParsedFeaturePolicyHeader& parsed_header) {
+  ResetFeaturePolicy();
   replication_state_.feature_policy_header = parsed_header;
+  feature_policy_->SetHeaderPolicy(parsed_header);
 }
 
 void FrameTreeNode::ResetFeaturePolicy() {
   replication_state_.feature_policy_header.clear();
+  FeaturePolicy* parent_policy =
+      parent() ? parent()->feature_policy_.get() : nullptr;
+  feature_policy_ =
+      FeaturePolicy::CreateFromParentPolicy(parent_policy, current_origin());
 }
 
 void FrameTreeNode::AddContentSecurityPolicy(