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 6551608a4d8b35f06e988e1b3b1ebc68316609ef..a1badc0728ad9df0fc3c0e050194c4a4d7e41491 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -1824,6 +1824,8 @@ 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(
@@ -3361,6 +3363,18 @@ void RenderFrameHostImpl::DeleteWebBluetoothService(
   web_bluetooth_services_.erase(it);
 }
 
+const FeaturePolicy* RenderFrameHostImpl::GetFeaturePolicy() {

[alexmos, 2017/02/09 05:59:50]

This is a simple getter, so it could just go inlined into the header as
get_feature_policy().

[iclelland, 2017/02/09 17:16:17]

Done.

+  return feature_policy_.get();
+}
+
+void RenderFrameHostImpl::ResetFeaturePolicy() {
+  RenderFrameHostImpl* parent_frame_host = GetParent();
+  const FeaturePolicy* parent_policy =
+      parent_frame_host ? parent_frame_host->GetFeaturePolicy() : nullptr;
+  feature_policy_ = FeaturePolicy::CreateFromParentPolicy(
+      parent_policy, last_committed_origin_);
+}
+
 void RenderFrameHostImpl::Create(
     const service_manager::Identity& remote_identity,
     media::mojom::InterfaceFactoryRequest request) {