Add PeerConnectionInterface::UpdateCallBitrate.

webrtc/pc/peerconnectioninterface_unittest.cc

Index: webrtc/pc/peerconnectioninterface_unittest.cc
diff --git a/webrtc/pc/peerconnectioninterface_unittest.cc b/webrtc/pc/peerconnectioninterface_unittest.cc
index 05d53ad1a153fdcacc66f240d706c88f69d51f64..ab27cb6f64b56f175d675c046ddc37775e9b48a8 100644
--- a/webrtc/pc/peerconnectioninterface_unittest.cc
+++ b/webrtc/pc/peerconnectioninterface_unittest.cc
@@ -3286,6 +3286,18 @@ TEST_F(PeerConnectionInterfaceTest,
   EXPECT_TRUE(DoSetLocalDescription(answer.release()));
 }
 
+TEST_F(PeerConnectionInterfaceTest, SetCallBitrateWithoutMinSucceeds) {
+  CreatePeerConnection();
+  PeerConnectionInterface::BitrateParameters bitrate;
+  bitrate.start_bitrate_bps = rtc::Optional<int>(100000);
+  // Call doesn't expose its current config, so we just check that the
+  // method invocation succeeds here.
+  pc_->SetCallBitrate(bitrate);
+}
+
+// TODO(zstein): More exhaustive tests of
+// PeerConnectionInterface::SetCallBitrate
+
 class PeerConnectionMediaConfigTest : public testing::Test {
  protected:
   void SetUp() override {