Domain Reliability: Add sample_rate field to Beacon

components/domain_reliability/context_unittest.cc

Index: components/domain_reliability/context_unittest.cc
diff --git a/components/domain_reliability/context_unittest.cc b/components/domain_reliability/context_unittest.cc
index ccbccacce9eaa45dceddb09415fa1e41e65fbb30..df4dc5fe9ad80e427815b463aa857cf631984b51 100644
--- a/components/domain_reliability/context_unittest.cc
+++ b/components/domain_reliability/context_unittest.cc
@@ -214,7 +214,7 @@ TEST_F(DomainReliabilityContextTest, ReportUpload) {
       "\"network_changed\":false,\"protocol\":\"HTTP\","
       "\"request_age_ms\":300250,\"request_elapsed_ms\":250,"
       "\"server_ip\":\"127.0.0.1\",\"status\":\"tcp.connection_reset\","
-      "\"url\":\"https://localhost/\",\"was_proxied\":false}],"
+      "\"url\":\"https://localhost/\",\"was_proxied\":false,\"weight\":1}],"

[jkarlin, 2015/12/07 14:57:27]

A weight of 1 isn't testing that division is happening.

[Deprecated (see juliatuttle), 2015/12/07 20:17:57]

Acknowledged.

       "\"reporter\":\"test-reporter\"}";
 
   time_.Advance(max_delay());
@@ -244,7 +244,7 @@ TEST_F(DomainReliabilityContextTest, Upload_NetworkChanged) {
       "\"network_changed\":true,\"protocol\":\"HTTP\","
       "\"request_age_ms\":300250,\"request_elapsed_ms\":250,"
       "\"server_ip\":\"127.0.0.1\",\"status\":\"tcp.connection_reset\","
-      "\"url\":\"https://localhost/\",\"was_proxied\":false}],"
+      "\"url\":\"https://localhost/\",\"was_proxied\":false,\"weight\":1}],"
       "\"reporter\":\"test-reporter\"}";
 
   // Simulate a network change after the request but before the upload.