Add FakeNetworkPipe ctor from NetworkSimulationInterface.

Add FakeNetworkPipe ctor from NetworkSimulationInterface to be able to
inject different implementations of simulated networks.

If user requires to do something with injected simulation he can keep
raw reference, or introduce some proxy, that will hide shared ownership
from FakeNetworkPipe. Also FakeNetworkPipe guarantee to keep simulation
object alive while it is alive itself.

Bug: webrtc:9630
Change-Id: Ie00ea1d47bf7658b0c6433cf2efbf364f885c8a0
Reviewed-on: https://webrtc-review.googlesource.com/94153
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24312}

call/fake_network_pipe.cc

@@ -43,6 +43,7 @@ NetworkPacket::NetworkPacket(rtc::CopyOnWriteBuffer packet,
       is_rtcp_(is_rtcp),
       media_type_(media_type),
       packet_time_us_(packet_time_us) {}
+
 NetworkPacket::NetworkPacket(rtc::CopyOnWriteBuffer packet,
                              int64_t send_time,
                              int64_t arrival_time,
@@ -87,6 +88,20 @@ FakeNetworkPipe::FakeNetworkPipe(Clock* clock,
                                  const FakeNetworkPipe::Config& config)
     : FakeNetworkPipe(clock, config, nullptr, 1) {}
 
+FakeNetworkPipe::FakeNetworkPipe(
+    Clock* clock,
+    std::unique_ptr<NetworkSimulationInterface> network_simulation)
+    : clock_(clock),
+      network_simulation_(std::move(network_simulation)),
+      receiver_(nullptr),
+      transport_(nullptr),
+      clock_offset_ms_(0),
+      dropped_packets_(0),
+      sent_packets_(0),
+      total_packet_delay_us_(0),
+      next_process_time_us_(clock_->TimeInMicroseconds()),
+      last_log_time_us_(clock_->TimeInMicroseconds()) {}
+
 FakeNetworkPipe::FakeNetworkPipe(Clock* clock,
                                  const FakeNetworkPipe::Config& config,
                                  PacketReceiver* receiver)

call/fake_network_pipe.h

@@ -105,6 +105,10 @@ class FakeNetworkPipe : public Transport, public PacketReceiver, public Module {
 
   // Use these constructors if you plan to insert packets using DeliverPacket().
   FakeNetworkPipe(Clock* clock, const FakeNetworkPipe::Config& config);
+  // Will keep |network_simulation| alive while pipe is alive itself.
+  FakeNetworkPipe(
+      Clock* clock,
+      std::unique_ptr<NetworkSimulationInterface> network_simulation);
   FakeNetworkPipe(Clock* clock,
                   const FakeNetworkPipe::Config& config,
                   PacketReceiver* receiver);