Added test for generating stats for a track added using addTrack

Also fixes a misspelling of "timestamp" as "timeStamp".

Bug: webrtc:8616
Change-Id: I76304d9235bbb1e4fca1e821a2e10dff0777bb2d
Reviewed-on: https://chromium-review.googlesource.com/824269
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523806}

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCPeerConnection-getStats.https-expected.txt

@@ -6,9 +6,11 @@ FAIL getStats() with track added via addTrack should succeed promise_test: Unhan
 FAIL getStats() with track added via addTransceiver should succeed assert_idl_attribute: Expect pc to have addTransceiver() method property "addTransceiver" not found in prototype chain
 FAIL getStats() with track associated with more than one sender should reject with InvalidAccessError promise_test: Unhandled rejection with value: object "TypeError: pc.addTransceiver is not a function"
 FAIL getStats() with track associated with both sender and receiver should reject with InvalidAccessError pc.addTransceiver is not a function
-FAIL getStats() with no argument should return stats report containing peer-connection stats assert_equals: Expect dictionary.timeStamp to be number expected "number" but got "undefined"
+PASS getStats() with no argument should return stats report containing peer-connection stats on an empty PC
+FAIL getStats() with no argument should return stats report containing peer-connection stats and outbound-track-stats assert_true: Expect statsReport to contain stats object of type outbound-rtp expected true got false
+FAIL getStats() with no argument should return stats for no-stream tracks assert_true: Expect statsReport to contain stats object of type outbound-rtp expected true got false
 FAIL getStats() on track associated with RtpSender should return stats report containing outbound-rtp stats promise_test: Unhandled rejection with value: object "TypeError: Failed to execute 'getStats' on 'RTCPeerConnection': The callback provided as parameter 1 is not a function."
 FAIL getStats() on track associated with RtpReceiver should return stats report containing inbound-rtp stats pc.addTransceiver is not a function
-FAIL getStats() with connected peer connections having tracks and data channel should return all mandatory to implement stats assert_unreached: test failed with error: Error: assert_equals: Expect dictionary.timeStamp to be number expected "number" but got "undefined" Reached unreachable code
+FAIL getStats() with connected peer connections having tracks and data channel should return all mandatory to implement stats assert_unreached: test failed with error: Error: assert_equals: Expect dictionary.issuerCertificateId to be string expected "string" but got "undefined" Reached unreachable code
 Harness: the test ran to completion.
 

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCPeerConnection-getStats.https.html

@@ -122,7 +122,35 @@
       validateStatsReport(statsReport);
       assert_stats_report_has_stats(statsReport, ['peer-connection']);
     });
-  }, 'getStats() with no argument should return stats report containing peer-connection stats');
+  }, 'getStats() with no argument should return stats report containing peer-connection stats on an empty PC');
+
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+    return getTrackFromUserMedia('audio')
+    .then(([track, mediaStream]) => {
+      pc.addTrack(track, mediaStream);
+      return pc.getStats();
+    })
+    .then(statsReport => {
+      validateStatsReport(statsReport);
+      assert_stats_report_has_stats(statsReport, ['peer-connection']);
+      assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
+    });
+  }, 'getStats() with no argument should return stats report containing peer-connection stats and outbound-track-stats');
+
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+    return getTrackFromUserMedia('audio')
+    .then(([track, mediaStream]) => {
+      pc.addTrack(track);
+      return pc.getStats();
+    })
+    .then(statsReport => {
+      validateStatsReport(statsReport);
+      assert_stats_report_has_stats(statsReport, ['peer-connection']);
+      assert_stats_report_has_stats(statsReport, ['outbound-rtp']);
+    });
+  }, 'getStats() with no argument should return stats for no-stream tracks');
 
   /*
     8.5.  The stats selection algorithm

third_party/WebKit/LayoutTests/external/wpt/webrtc/RTCStats-helper.js

@@ -136,7 +136,7 @@ function validateOptionalIdField(statsReport, stats, field, type) {
     };
  */
 function validateRtcStats(statsReport, stats) {
-  assert_number_field(stats, 'timeStamp');
+  assert_number_field(stats, 'timestamp');
   assert_string_field(stats, 'type');
   assert_string_field(stats, 'id');
 }