Use the Previews Black List for server previews

components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
index 5bc7b57a8b9b61214535559f351d462ebba180d4..56279bdc5372e6d2d0361686b970abc000c5a671 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h
@@ -42,6 +42,10 @@ class URLRequestContextGetter;
 class URLRequestStatus;
 }
 
+namespace previews {
+class PreviewsDecider;
+}
+
 namespace data_reduction_proxy {
 
 typedef base::Callback<void(const std::string&,
@@ -194,11 +198,13 @@ class DataReductionProxyConfig
   // Returns true when Lo-Fi Previews should be activated. Records metrics for
   // Lo-Fi state changes. |request| is used to get the network quality estimator
   // from the URLRequestContext.
-  bool ShouldEnableLoFi(const net::URLRequest& request);
+  bool ShouldEnableLoFi(const net::URLRequest& request,
+                        previews::PreviewsDecider* previews_decider);

[megjablon, 2017/05/09 19:58:33]

Add comment for what |previews_decider| is for. Same for three methods below.

[RyanSturm, 2017/05/09 22:35:19]

Done.

 
   // Returns true when Lite Page Previews should be activated. |request| is used
   // to get the network quality estimator from the URLRequestContext.
-  bool ShouldEnableLitePages(const net::URLRequest& request);
+  bool ShouldEnableLitePages(const net::URLRequest& request,
+                             previews::PreviewsDecider* previews_decider);
 
   // Returns true if the data saver has been enabled by the user, and the data
   // saver proxy is reachable.
@@ -294,15 +300,16 @@ class DataReductionProxyConfig
   // Returns true when Lo-Fi Previews should be activated. Determines if Lo-Fi
   // Previews should be activated by checking the Lo-Fi flags and if the network
   // quality is prohibitively slow. |network_quality_estimator| may be NULL.
-  bool ShouldEnableLoFiInternal(
-      const net::NetworkQualityEstimator* network_quality_estimator);
+  bool ShouldEnableLoFiInternal(const net::URLRequest& request,
+                                previews::PreviewsDecider* previews_decider);
 
   // Returns true when Lite Page Previews should be activated. Determines if
   // Lite Page Previewsmode should be activated by checking the Lite Page
   // Previews flags and if the network quality is prohibitively slow.
   // |network_quality_estimator| may be NULL.
   bool ShouldEnableLitePagesInternal(
-      const net::NetworkQualityEstimator* network_quality_estimator);
+      const net::URLRequest& request,
+      previews::PreviewsDecider* previews_decider);
 
   // Returns true if the network quality is at least as poor as the one
   // specified in the Auto Lo-Fi field trial parameters.