Probing: Add support for exponential startup probing

webrtc/modules/pacing/bitrate_prober_unittest.cc

Index: webrtc/modules/pacing/bitrate_prober_unittest.cc
diff --git a/webrtc/modules/pacing/bitrate_prober_unittest.cc b/webrtc/modules/pacing/bitrate_prober_unittest.cc
index 1b2a321573b6267bb2c42584882bad0fd574b952..9f1127f7e8991e9ff5685ca465438c1cb445e0a9 100644
--- a/webrtc/modules/pacing/bitrate_prober_unittest.cc
+++ b/webrtc/modules/pacing/bitrate_prober_unittest.cc
@@ -25,7 +25,7 @@ TEST(BitrateProberTest, VerifyStatesAndTimeBetweenProbes) {
   prober.ProbeAtBitrate(1800000, 5);
   EXPECT_FALSE(prober.IsProbing());
 
-  prober.OnIncomingPacket(1000);
+  prober.OnIncomingPacket(now_ms, 1000);
   EXPECT_TRUE(prober.IsProbing());
   EXPECT_EQ(0, prober.CurrentClusterId());
 
@@ -63,7 +63,7 @@ TEST(BitrateProberTest, DoesntProbeWithoutRecentPackets) {
   prober.ProbeAtBitrate(900000, 6);
   EXPECT_FALSE(prober.IsProbing());
 
-  prober.OnIncomingPacket(1000);
+  prober.OnIncomingPacket(now_ms, 1000);
   EXPECT_TRUE(prober.IsProbing());
   EXPECT_EQ(0, prober.TimeUntilNextProbe(now_ms));
   prober.PacketSent(now_ms, 1000);
@@ -71,25 +71,25 @@ TEST(BitrateProberTest, DoesntProbeWithoutRecentPackets) {
   now_ms += 6000;
   EXPECT_EQ(-1, prober.TimeUntilNextProbe(now_ms));
   // Insert a small packet, not a candidate for probing.
-  prober.OnIncomingPacket(100);
+  prober.OnIncomingPacket(now_ms, 100);
   prober.PacketSent(now_ms, 100);
   EXPECT_EQ(-1, prober.TimeUntilNextProbe(now_ms));
   // Insert a large-enough packet after downtime while probing should reset to
   // perform a new probe since the requested one didn't finish.
-  prober.OnIncomingPacket(1000);
+  prober.OnIncomingPacket(now_ms, 1000);
   EXPECT_EQ(0, prober.TimeUntilNextProbe(now_ms));
   prober.PacketSent(now_ms, 1000);
   // Next packet should be part of new probe and be sent with non-zero delay.
-  prober.OnIncomingPacket(1000);
+  prober.OnIncomingPacket(now_ms, 1000);
   EXPECT_GT(prober.TimeUntilNextProbe(now_ms), 0);
 }
 
 TEST(BitrateProberTest, DoesntInitializeProbingForSmallPackets) {
   BitrateProber prober;
-  prober.SetEnabled(true);
   EXPECT_FALSE(prober.IsProbing());
 
-  prober.OnIncomingPacket(100);
+  int64_t now_ms = 0;
+  prober.OnIncomingPacket(now_ms, 100);
   EXPECT_FALSE(prober.IsProbing());
 }