Set pacer target bitrate to max of bwe and bitrate allocation.

webrtc/modules/bitrate_controller/bitrate_allocator.cc

Index: webrtc/modules/bitrate_controller/bitrate_allocator.cc
diff --git a/webrtc/modules/bitrate_controller/bitrate_allocator.cc b/webrtc/modules/bitrate_controller/bitrate_allocator.cc
index 0aec528cde170c1e11ab983708c0a3894c5321d5..3b561f21548d1968ae4592e7832a2678dbf80add 100644
--- a/webrtc/modules/bitrate_controller/bitrate_allocator.cc
+++ b/webrtc/modules/bitrate_controller/bitrate_allocator.cc
@@ -32,17 +32,20 @@ BitrateAllocator::BitrateAllocator()
       last_rtt_(0) {
 }
 
-
-void BitrateAllocator::OnNetworkChanged(uint32_t bitrate,
-                                        uint8_t fraction_loss,
-                                        int64_t rtt) {
+uint32_t BitrateAllocator::OnNetworkChanged(uint32_t bitrate,
+                                            uint8_t fraction_loss,
+                                            int64_t rtt) {
   CriticalSectionScoped lock(crit_sect_.get());
   last_bitrate_bps_ = bitrate;
   last_fraction_loss_ = fraction_loss;
   last_rtt_ = rtt;
+  uint32_t allocated_bitrate = 0;
   ObserverBitrateMap allocation = AllocateBitrates();
-  for (const auto& kv : allocation)
+  for (const auto& kv : allocation) {
     kv.first->OnNetworkChanged(kv.second, last_fraction_loss_, last_rtt_);
+    allocated_bitrate += kv.second;
+  }
+  return allocated_bitrate;
 }
 
 BitrateAllocator::ObserverBitrateMap BitrateAllocator::AllocateBitrates() {