[Cast] Repair receiver playout time calculations and frame skip logic.

media/cast/transport/cast_transport_config.cc

Index: media/cast/transport/cast_transport_config.cc
diff --git a/media/cast/transport/cast_transport_config.cc b/media/cast/transport/cast_transport_config.cc
index b6dba5215043ab8acbf68a813fce718f318cbe2e..22903413ccee5305cd01693fa37dcee43e17953f 100644
--- a/media/cast/transport/cast_transport_config.cc
+++ b/media/cast/transport/cast_transport_config.cc
@@ -12,6 +12,29 @@ namespace {
 const int kDefaultRtpMaxDelayMs = 100;
 }  // namespace
 
+bool CanDropFramesForCodec(AudioCodec audio_codec) {
+  switch (audio_codec) {
+    case kFakeSoftwareAudio:
+    case kOpus:
+    case kPcm16:
+      return true;
+  }
+  NOTREACHED();
+  return true;
+}
+
+bool CanDropFramesForCodec(VideoCodec video_codec) {
+  switch (video_codec) {
+    case kFakeSoftwareVideo:
+      return true;
+    case kVp8:
+    case kH264:
+      return false;
+  }
+  NOTREACHED();
+  return true;
+}
+
 RtpConfig::RtpConfig()
     : ssrc(0),
       max_delay_ms(kDefaultRtpMaxDelayMs),