Moves channel-dependent audio input processing to separate encoder task queue

webrtc/base/swap_queue.h

Index: webrtc/base/swap_queue.h
diff --git a/webrtc/base/swap_queue.h b/webrtc/base/swap_queue.h
index 1851309bd7356d808dc45fadad23622bbcb4ea8b..1b66cec8807fab36b70a51bdbeb0f27e18bc2e44 100644
--- a/webrtc/base/swap_queue.h
+++ b/webrtc/base/swap_queue.h
@@ -104,6 +104,16 @@ class SwapQueue {
     RTC_DCHECK(VerifyQueueSlots());
   }
 
+  size_t Capacity() const {
+    rtc::CritScope cs(&crit_queue_);
+    return queue_.size();
+  }
+
+  size_t Size() const {
+    rtc::CritScope cs(&crit_queue_);
+    return num_elements_;
+  }
+
   // Resets the queue to have zero content wile maintaining the queue size.
   void Clear() {
     rtc::CritScope cs(&crit_queue_);