RTCIceCandidatePairStats.consentRequestsSent set by RTCStatsCollector
and requestsSent is updated.

Before:
  requestsSent = total ping requests
Now
  requestsSent = pings sent before first response
  consentRequestsSent = pings after first response

Spec: https://w3c.github.io/webrtc-stats/#dom-rtcicecandidatepairstats-consentrequestssent

BUG=chromium:633550

Review-Url: https://codereview.webrtc.org/2558293002
Cr-Commit-Position: refs/heads/master@{#15541}
diff --git a/webrtc/api/rtcstatscollector_unittest.cc b/webrtc/api/rtcstatscollector_unittest.cc
index 2d2059b..b973044 100644
--- a/webrtc/api/rtcstatscollector_unittest.cc
+++ b/webrtc/api/rtcstatscollector_unittest.cc
@@ -1006,7 +1006,8 @@
   connection_info.recv_total_bytes = 1234;
   connection_info.rtt = 1337;
   connection_info.recv_ping_requests = 2020;
-  connection_info.sent_ping_requests_total = 1010;
+  connection_info.sent_ping_requests_total = 2020;
+  connection_info.sent_ping_requests_before_first_response = 2000;
   connection_info.recv_ping_responses = 4321;
   connection_info.sent_ping_responses = 1000;
 
@@ -1041,9 +1042,10 @@
   expected_pair.bytes_received = 1234;
   expected_pair.current_rtt = 1.337;
   expected_pair.requests_received = 2020;
-  expected_pair.requests_sent = 1010;
+  expected_pair.requests_sent = 2000;
   expected_pair.responses_received = 4321;
   expected_pair.responses_sent = 1000;
+  expected_pair.consent_requests_sent = (2020 - 2000);
 
   EXPECT_TRUE(report->Get(expected_pair.id()));
   EXPECT_EQ(