Check the sample rate before passing the device specific audio params to webrtc audio renderer.

This fixes the problem on some platforms where it does not support query the audio params of specific device.

R=tommi@chromium.org

Review URL: https://codereview.chromium.org/23742005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222230 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/media/media_stream_impl.cc

@@ -700,8 +700,10 @@ bool MediaStreamImpl::GetAuthorizedDeviceInfoForAudioRenderer(
     }
   }
 
-  if (session_id_str.isEmpty() || !device_info)
+  if (session_id_str.isEmpty() || !device_info ||
+      !device_info->device.matched_output.sample_rate) {
     return false;
+  }
 
   base::StringToInt(UTF16ToUTF8(session_id_str), session_id);
   *output_sample_rate = device_info->device.matched_output.sample_rate;