Domain Reliability: Add was_proxied field to beacons.

This makes it explicit why server_ip is blank when the connection was
proxied, so we can tell when it's blank because of a bug instead.

BUG=

Review URL: https://codereview.chromium.org/1088933007

Cr-Commit-Position: refs/heads/master@{#326739}

components/domain_reliability/beacon.cc

@@ -33,6 +33,7 @@ Value* DomainReliabilityBeacon::ToValue(
     beacon_value->Set("failure_data", failure_value);
   }
   beacon_value->SetString("server_ip", server_ip);
+  beacon_value->SetBoolean("was_proxied", was_proxied);
   beacon_value->SetString("protocol", protocol);
   if (http_response_code >= 0)
     beacon_value->SetInteger("http_response_code", http_response_code);

components/domain_reliability/beacon.h

@@ -39,6 +39,9 @@ struct DOMAIN_RELIABILITY_EXPORT DomainReliabilityBeacon {
   int chrome_error;
   // IP address of the server the request went to.
   std::string server_ip;
+  // Whether the request went through a proxy. If true, |server_ip| will be
+  // empty.
+  bool was_proxied;
   // Protocol used to make the request.
   std::string protocol;
   // HTTP response code returned by the server, or -1 if none was received.

components/domain_reliability/context_unittest.cc

@@ -30,6 +30,7 @@ DomainReliabilityBeacon MakeBeacon(MockableTime* time) {
   beacon.status = "ok";
   beacon.chrome_error = net::OK;
   beacon.server_ip = "127.0.0.1";
+  beacon.was_proxied = false;
   beacon.protocol = "HTTP";
   beacon.http_response_code = 200;
   beacon.elapsed = base::TimeDelta::FromMilliseconds(250);
@@ -179,7 +180,8 @@ TEST_F(DomainReliabilityContextTest, ReportUpload) {
           "\"http_response_code\":200,\"network_changed\":false,"
           "\"protocol\":\"HTTP\",\"request_age_ms\":300250,"
           "\"request_elapsed_ms\":250,\"resource\":\"always_report\","
-          "\"server_ip\":\"127.0.0.1\",\"status\":\"ok\"}],"
+          "\"server_ip\":\"127.0.0.1\",\"status\":\"ok\","
+          "\"was_proxied\":false}],"
       "\"reporter\":\"test-reporter\","
       "\"resources\":[{\"failed_requests\":0,\"name\":\"always_report\","
           "\"successful_requests\":1}]}";
@@ -216,7 +218,8 @@ TEST_F(DomainReliabilityContextTest, ReportUpload_NetworkChanged) {
           "\"http_response_code\":200,\"network_changed\":true,"
           "\"protocol\":\"HTTP\",\"request_age_ms\":300250,"
           "\"request_elapsed_ms\":250,\"resource\":\"always_report\","
-          "\"server_ip\":\"127.0.0.1\",\"status\":\"ok\"}],"
+          "\"server_ip\":\"127.0.0.1\",\"status\":\"ok\","
+          "\"was_proxied\":false}],"
       "\"reporter\":\"test-reporter\","
       "\"resources\":[{\"failed_requests\":0,\"name\":\"always_report\","
           "\"successful_requests\":1}]}";

components/domain_reliability/monitor.cc

@@ -280,6 +280,7 @@ void DomainReliabilityMonitor::OnRequestLegComplete(
   beacon.http_response_code = response_code;
   beacon.start_time = request.load_timing_info.request_start;
   beacon.elapsed = time_->NowTicks() - beacon.start_time;
+  beacon.was_proxied = request.response_info.was_fetched_via_proxy;
   beacon.domain = request.url.host();
   context_manager_.RouteBeacon(request.url, beacon);
 }