webrtc: Fix missing port forwarding on CrOS

telemetry/telemetry/internal/platform/cros_platform_backend.py

Index: telemetry/telemetry/internal/platform/cros_platform_backend.py
diff --git a/telemetry/telemetry/internal/platform/cros_platform_backend.py b/telemetry/telemetry/internal/platform/cros_platform_backend.py
index 01f2034bd0f30f078cf17b86677e414694a6b436..1b8ae0c1db47cd2d6c575f9cb250aa1167b16e46 100644
--- a/telemetry/telemetry/internal/platform/cros_platform_backend.py
+++ b/telemetry/telemetry/internal/platform/cros_platform_backend.py
@@ -55,6 +55,13 @@ class CrosPlatformBackend(
       return port
     return self._cri.GetRemotePort()
 
+  def CreatePortForwarder(self, port_pair, use_remote_port_forwarding=False):
+    return self.forwarder_factory.Create(port_pair, use_remote_port_forwarding)
+
+  def IsRemoteDevice(self):
+    # Check if CrOS device is remote.
+    return self._cri and not self._cri.local
+
   def IsThermallyThrottled(self):
     raise NotImplementedError()