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 2004107fe107d352a164d7bae5701d653cc734d7..96046a85e2543ee0c4d11b697fe9eaae200b758b 100644
--- a/content/browser/frame_host/frame_tree_node.h
+++ b/content/browser/frame_host/frame_tree_node.h
@@ -17,6 +17,7 @@
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_frame_host_manager.h"
 #include "content/common/content_export.h"
+#include "content/common/feature_policy/feature_policy.h"

[raymes, 2017/02/01 22:42:21]

nit: I think we can forward declare this instead?

[iclelland, 2017/02/03 16:38:29]

Done.

 #include "content/common/frame_owner_properties.h"
 #include "content/common/frame_replication_state.h"
 #include "third_party/WebKit/public/platform/WebInsecureRequestPolicy.h"
@@ -352,6 +353,8 @@ class CONTENT_EXPORT FrameTreeNode {
   // proxies for this frame.
   FrameReplicationState replication_state_;
 
+  std::unique_ptr<FeaturePolicy> feature_policy_;
+
   // Track the pending sandbox flags for this frame.  When a parent frame
   // dynamically updates sandbox flags in the <iframe> element for a child
   // frame, these updated flags are stored here and are transferred into