AudioConverter: Express delay in frames rather than msec.

extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc

Index: extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc
diff --git a/extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc b/extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc
index 4e91de25f99c835f47484e87b2552d08263216a2..b7d3d9dc5208cf988db04c6aca1582d542c6af8a 100644
--- a/extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc
+++ b/extensions/renderer/api/display_source/wifi_display/wifi_display_audio_encoder_lpcm.cc
@@ -51,7 +51,7 @@ class WiFiDisplayAudioEncoderLPCM final
 
   // media::AudioConverter::InputCallback
   double ProvideInput(media::AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+                      uint32_t frames_delayed) override;
 
   LPCMAudioStreamDescriptor::SamplingFrequency GetOutputSamplingFrequency()
       const;
@@ -205,7 +205,7 @@ void WiFiDisplayAudioEncoderLPCM::OnSetFormat(
 
 // Called on real-time audio thread by |converter_| invoked by |OnData|.
 double WiFiDisplayAudioEncoderLPCM::ProvideInput(media::AudioBus* audio_bus,
-                                                 base::TimeDelta buffer_delay) {
+                                                 uint32_t frames_delayed) {
   DCHECK(current_input_bus_);
   current_input_bus_->CopyTo(audio_bus);
   current_input_bus_ = nullptr;