Move adding Lo-Fi directives from DRPRequestOptions to ContentLoFiDecider

components/data_reduction_proxy/content/browser/content_lofi_decider.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_
 
 #include "components/data_reduction_proxy/core/common/lofi_decider.h"
 #include "base/macros.h"
 
 namespace net {
+class HttpRequestHeaders;
 class URLRequest;
 }
 
 namespace data_reduction_proxy {
 
 // Class responsible for deciding whether a request should be requested with low
 // fidelity (Lo-Fi) or not. Relies on the Lo-Fi mode state stored in the
 // request's content::ResourceRequestInfo, which must be fetched using
-// content::ResourceRequestInfo::ForRequest. Owned by DataReductionProxyIOData
-// and should be called on the IO thread.
+// content::ResourceRequestInfo::ForRequest. Lo-Fi mode will not be enabled for
+// requests that don't have a ResourceRequestInfo, such as background requests.
+// Owned by DataReductionProxyIOData and should be called on the IO thread.
 class ContentLoFiDecider : public LoFiDecider {
  public:
   ContentLoFiDecider();
   ~ContentLoFiDecider() override;
 
+  // LoFiDecider implementation:
   bool IsUsingLoFiMode(const net::URLRequest& request) const override;
+  bool MaybeAddLoFiDirectiveToHeaders(
+      const net::URLRequest& request,
+      net::HttpRequestHeaders* headers) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentLoFiDecider);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_CONTENT_LOFI_DECIDER_H_