Adding opt out and previews type information to DRP pingback

components/data_reduction_proxy/proto/pageload_metrics.proto

 // Copyright 2016 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 import "client_config.proto";
 
@@ skipping 16 matching lines @@
   // each of the enum values.
   enum EffectiveConnectionType {
     EFFECTIVE_CONNECTION_TYPE_UNKNOWN = 0;
     EFFECTIVE_CONNECTION_TYPE_OFFLINE = 1;
     EFFECTIVE_CONNECTION_TYPE_SLOW_2G = 2;
     EFFECTIVE_CONNECTION_TYPE_2G = 3;
     EFFECTIVE_CONNECTION_TYPE_3G = 4;
     EFFECTIVE_CONNECTION_TYPE_4G = 5;
   };
 
+  // The various opt out states seen by server previews.
+  enum PreviewsOptOut {
+    // Set for non-previews navigations and app background navigations.
+    UNKNOWN = 0;
+    // Set for previews navigations that clicked "show original".
+    OPT_OUT = 1;
+    // Set for previews navigations that did not click "show original".
+    NON_OPT_OUT = 2;
+  }
+
+  // The various server previews that can be shown.
+  enum PreviewsType {
+    // No server preview was applied.
+    NONE = 0;
+    // Image placeholders were used on the page.
+    LOFI = 1;
+    // The main resource was a lite page.
+    LITE_PAGE = 2;
+  }
+
   // The session key used to load the page.
   optional string session_key = 1;
   // The time at which the first request of the pageload was made, according to
   // the client's clock.
   optional Timestamp first_request_time = 2;
   // The URL of the main page request.
   optional string first_request_url = 4;
   // The URL of the last request.
   optional string last_request_url = 5;
 
@@ skipping 21 matching lines @@
 
   // Time until parsing finished.
   optional Duration parse_stop = 14;
 
   // Time to first meaningful paint. This measure is unstable and will change
   // over time.
   optional Duration experimental_time_to_first_meaningful_paint = 15;
 
   // The unique identifier for the page load.
   optional uint64 page_id = 16;
+
+  // The opt out state of the page load.
+  optional PreviewsOptOut previews_opt_out = 17;
+
+  // The previews type that was used on the page.
+  optional PreviewsType previews_type = 18;
 }