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

content/browser/frame_host/frame_tree_node.h

Index: content/browser/frame_host/frame_tree_node.h
diff --git a/content/browser/frame_host/frame_tree_node.h b/content/browser/frame_host/frame_tree_node.h
index 503911bb69c27ca294316b4500801b1c45357c55..7a4a0b9e20425f5b7d359840ccbc2d57f2dffbfc 100644
--- a/content/browser/frame_host/frame_tree_node.h
+++ b/content/browser/frame_host/frame_tree_node.h
@@ -161,12 +161,11 @@ class CONTENT_EXPORT FrameTreeNode {
   // Set the current name and notify proxies about the update.
   void SetFrameName(const std::string& name, const std::string& unique_name);
 
-  // Set the frame's feature policy from an HTTP header, clearing any existing
-  // policy.
+  // Set the frame's feature policy header, clearing any existing header.
   void SetFeaturePolicyHeader(const ParsedFeaturePolicyHeader& parsed_header);
 
-  // Clear any feature policy associated with the frame.
-  void ResetFeaturePolicy();
+  // Clear any feature policy header associated with the frame.
+  void ResetFeaturePolicyHeader();
 
   // Add CSP header to replication state and notify proxies about the update.
   void AddContentSecurityPolicy(const ContentSecurityPolicyHeader& header);