[Fuchsia] Set AudioRenderer usage

Previously AudioOutputStreamFuchsia wasn't setting stream usage for the
AudioRenderer. The usage is required by the system audio service to make
correct audio policy decisions for the stream. This change updates
AudioOutputStreamFuchsia to SetUsage() appropriately.

Bug: 1065605
Change-Id: If96a9b0713b4acdff63035725b7322d1a5ad65a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500431
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821483}

media/audio/fuchsia/audio_output_stream_fuchsia.cc

@@ -17,12 +17,23 @@
 
 namespace media {
 
+namespace {
+
 // Current AudioRenderer implementation allows only one buffer with id=0.
 // TODO(crbug.com/1131179): Replace with an incrementing buffer id now that
 // AddPayloadBuffer() and RemovePayloadBuffer() are implemented properly in
 // AudioRenderer.
 const uint32_t kBufferId = 0;
 
+fuchsia::media::AudioRenderUsage GetStreamUsage(
+    const AudioParameters& parameters) {
+  if (parameters.latency_tag() == AudioLatency::LATENCY_RTC)
+    return fuchsia::media::AudioRenderUsage::COMMUNICATION;
+  return fuchsia::media::AudioRenderUsage::MEDIA;
+}
+
+}  // namespace
+
 AudioOutputStreamFuchsia::AudioOutputStreamFuchsia(
     AudioManagerFuchsia* manager,
     const AudioParameters& parameters)
@@ -47,6 +58,8 @@ bool AudioOutputStreamFuchsia::Open() {
   audio_renderer_.set_error_handler(
       fit::bind_member(this, &AudioOutputStreamFuchsia::OnRendererError));
 
+  audio_renderer_->SetUsage(GetStreamUsage(parameters_));
+
   // Inform the |audio_renderer_| of the format required by the caller.
   fuchsia::media::AudioStreamType format;
   format.sample_format = fuchsia::media::AudioSampleFormat::FLOAT;