Revert of Remove the last piece of deprecated synchronous IO code. (patchset #5 of https://codereview.chromium.org/460373002/)

Reason for revert:
Build failure on Google Chrome ChromeOS:

http://build.chromium.org/p/chromium.chrome/buildstatus?builder=Google%20Chrome%20ChromeOS&number=71164

Original issue's description:
> Remove the last piece of deprecated synchronous IO code.
>
> BUG=337096
> TEST=bots
>
> Committed: https://chromium.googlesource.com/chromium/src/+/c4a64ffdd0d511c66d774341fa0a318af7911193

TBR=dalecurtis@chromium.org,ajm@chromium.org,rkc@chromium.org,avi@chromium.org,palmer@chromium.org,xians@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=337096

Review URL: https://codereview.chromium.org/509893002

Cr-Commit-Position: refs/heads/master@{#292133}

1 files changed, 3 insertions, 1 deletions

diff --git a/media/audio/alsa/audio_manager_alsa.cc b/media/audio/alsa/audio_manager_alsa.cc
index 7624834..beb60ba 100644
--- a/media/audio/alsa/audio_manager_alsa.cc
+++ b/media/audio/alsa/audio_manager_alsa.cc
@@ -311,6 +311,7 @@ AudioParameters AudioManagerAlsa::GetPreferredOutputStreamParameters(
   int sample_rate = kDefaultSampleRate;
   int buffer_size = kDefaultOutputBufferSize;
   int bits_per_sample = 16;
+  int input_channels = 0;
   if (input_params.IsValid()) {
     // Some clients, such as WebRTC, have a more limited use case and work
     // acceptably with a smaller buffer size.  The check below allows clients
@@ -320,6 +321,7 @@ AudioParameters AudioManagerAlsa::GetPreferredOutputStreamParameters(
     sample_rate = input_params.sample_rate();
     bits_per_sample = input_params.bits_per_sample();
     channel_layout = input_params.channel_layout();
+    input_channels = input_params.input_channels();
     buffer_size = std::min(input_params.frames_per_buffer(), buffer_size);
   }
 
@@ -328,7 +330,7 @@ AudioParameters AudioManagerAlsa::GetPreferredOutputStreamParameters(
     buffer_size = user_buffer_size;
 
   return AudioParameters(
-      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
       sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
 }