Add encode time to WebRTC telemetry tests, remove some noisy metrics.

tools/perf/metrics/webrtc_stats.py

Index: tools/perf/metrics/webrtc_stats.py
diff --git a/tools/perf/metrics/webrtc_stats.py b/tools/perf/metrics/webrtc_stats.py
index 2a78ae7c2b0ed80360f9773d978dcb7aad3d17b6..60424c6da4242c0361794e1f8c9dfea73500ee49 100644
--- a/tools/perf/metrics/webrtc_stats.py
+++ b/tools/perf/metrics/webrtc_stats.py
@@ -13,14 +13,6 @@ from metrics import Metric
 
 
 INTERESTING_METRICS = {
-    'packetsReceived': {
-        'units': 'packets',
-        'description': 'Packets received by the peer connection',
-    },
-    'packetsSent': {
-        'units': 'packets',
-        'description': 'Packets sent by the peer connection',
-    },
     'googDecodeMs': {
         'units': 'ms',
         'description': 'Time spent decoding.',
@@ -29,6 +21,10 @@ INTERESTING_METRICS = {
         'units': 'ms',
         'description': 'Maximum time spent decoding one frame.',
     },
+    'googAvgEncodeMs': {
+        'units': 'ms',
+        'description': 'Average time spent encoding one frame.'
+    },
     'googRtt': {
         'units': 'ms',
         'description': 'Measured round-trip time.',
@@ -71,10 +67,6 @@ INTERESTING_METRICS = {
         'description': ('The target encoding bitrate we estimate is good to '
                         'aim for given our bandwidth estimates.')
     },
-    'googTransmitBitrate': {
-        'units': 'bit/s',
-        'description': 'The actual transmit bitrate.'
-    },
 }