Replicate feature policy headers to remote frames

content/common/frame_replication_state.h

Index: content/common/frame_replication_state.h
diff --git a/content/common/frame_replication_state.h b/content/common/frame_replication_state.h
index b3d3544d6a688ecb4af9f00286209337e79f613a..d48047aeda2ea4439b99434d7a61f211fed5f29c 100644
--- a/content/common/frame_replication_state.h
+++ b/content/common/frame_replication_state.h
@@ -84,6 +84,9 @@ struct CONTENT_EXPORT FrameReplicationState {
   // scratch.
   std::string unique_name;
 
+  // Feature policy headers
+  std::vector<std::string> feature_policy_headers;

[raymes, 2016/11/07 02:16:01]

Does this really need to be a vector of string, as opposed to just string? Can
we just replicate the frame's own header? Or am I missing something?

[iclelland, 2016/11/07 03:37:03]

I was thinking of the case of multiple HTTP headers, which need to be coalesced
into a single policy later, but that's handled already by ResourceResponse, so
there's no need to do that here.

+
   // Accumulated CSP headers - gathered from http headers, <meta> elements,
   // parent frames (in case of about:blank frames).
   std::vector<ContentSecurityPolicyHeader> accumulated_csp_headers;