AudioConverter: Express delay in frames rather than msec.

media/audio/virtual_audio_output_stream.cc

Index: media/audio/virtual_audio_output_stream.cc
diff --git a/media/audio/virtual_audio_output_stream.cc b/media/audio/virtual_audio_output_stream.cc
index 1740b405d17c36069271113b534453b05f8f51f1..75980b252bb23433f1841a3a96019e1c6e862d75 100644
--- a/media/audio/virtual_audio_output_stream.cc
+++ b/media/audio/virtual_audio_output_stream.cc
@@ -74,15 +74,14 @@ void VirtualAudioOutputStream::GetVolume(double* volume) {
 }
 
 double VirtualAudioOutputStream::ProvideInput(AudioBus* audio_bus,
-                                              base::TimeDelta buffer_delay) {
+                                              uint32_t frames_delayed) {
   // Note: This method may be invoked on any one thread, depending on the
   // platform.
   DCHECK(callback_);
 
-  DCHECK_GE(buffer_delay, base::TimeDelta());
-  const int64_t upstream_delay_in_bytes = params_.GetBytesPerSecond() *
-                                          buffer_delay /
-                                          base::TimeDelta::FromSeconds(1);
+  DCHECK_GE(frames_delayed, 0U);
+  const int64_t upstream_delay_in_bytes =

[DaleCurtis, 2016/05/24 20:27:02]

Mixing of int64_t + uint32_t seems unusual?

[chcunningham, 2016/05/25 18:21:14]

Made int64_t -> uint32_t. Not really sure why it was done this way. Originally
from: 

https://codereview.chromium.org/756733003/diff/1/media/audio/virtual_audio_ou...

Will confirm with miu@ before I land.

+      std::round(params_.GetBytesPerFrame() * frames_delayed);
   const int frames = callback_->OnMoreData(
       audio_bus, static_cast<uint32_t>(upstream_delay_in_bytes), 0);
   if (frames < audio_bus->frames())