message: Prepare for breakout of session_description.{h,cc}
  External dependencies require "visibility = [ "*" ]"
  to depend on the target.
  Cr-Commit-Position: refs/heads/master@{#34264}
diff: @@ -185,6 +185,7 @@ rtc_library("rtc_pc_base") {
  }
  rtc_source_set("session_description") {
  + visibility = [ "*" ]
  sources = [
  # Future home of
  #"session_description.cc",
  @@ -209,6 +210,7 @@ rtc_source_set("session_description") {
  }
  rtc_source_set("simulcast_description") {
  + visibility = [ "*" ]
  sources = [
  # Future home of
  # "simulcast_description.cc",
  