Reland of Remove SendPacer from ViEEncoder (patchset #13 id:240001 of https://codereview.we…

webrtc/call/bitrate_allocator.cc

Index: webrtc/call/bitrate_allocator.cc
diff --git a/webrtc/call/bitrate_allocator.cc b/webrtc/call/bitrate_allocator.cc
index 097378f02a17b9728581d955c83dfe5860b31681..4c8d2a0c441bb20f41d7dd7ac30eb4a2110a85d2 100644
--- a/webrtc/call/bitrate_allocator.cc
+++ b/webrtc/call/bitrate_allocator.cc
@@ -54,7 +54,9 @@ BitrateAllocator::ObserverBitrateMap BitrateAllocator::AllocateBitrates() {
   uint32_t sum_min_bitrates = 0;
   for (const auto& observer : bitrate_observers_)
     sum_min_bitrates += observer.second.min_bitrate;
-  if (last_bitrate_bps_ <= sum_min_bitrates)
+  if (last_bitrate_bps_ == 0)
+    return ZeroRateAllocation();
+  else if (last_bitrate_bps_ <= sum_min_bitrates)
     return LowRateAllocation(last_bitrate_bps_);
   else
     return NormalRateAllocation(last_bitrate_bps_, sum_min_bitrates);
@@ -104,18 +106,6 @@ void BitrateAllocator::RemoveObserver(BitrateAllocatorObserver* observer) {
   }
 }
 
-void BitrateAllocator::GetMinMaxBitrateSumBps(int* min_bitrate_sum_bps,
-                                              int* max_bitrate_sum_bps) const {
-  *min_bitrate_sum_bps = 0;
-  *max_bitrate_sum_bps = 0;
-
-  rtc::CritScope lock(&crit_sect_);
-  for (const auto& observer : bitrate_observers_) {
-    *min_bitrate_sum_bps += observer.second.min_bitrate;
-    *max_bitrate_sum_bps += observer.second.max_bitrate;
-  }
-}
-
 BitrateAllocator::BitrateObserverConfList::iterator
 BitrateAllocator::FindObserverConfigurationPair(
     const BitrateAllocatorObserver* observer) {
@@ -170,6 +160,14 @@ BitrateAllocator::ObserverBitrateMap BitrateAllocator::NormalRateAllocation(
   return allocation;
 }
 
+BitrateAllocator::ObserverBitrateMap BitrateAllocator::ZeroRateAllocation() {
+  ObserverBitrateMap allocation;
+  // Zero bitrate to all observers.
+  for (const auto& observer : bitrate_observers_)
+    allocation[observer.first] = 0;
+  return allocation;
+}
+
 BitrateAllocator::ObserverBitrateMap BitrateAllocator::LowRateAllocation(
     uint32_t bitrate) {
   ObserverBitrateMap allocation;