Ensures that WebRTC works for device selection using a different sample rate than default

content/public/common/media_stream_request.h

Index: content/public/common/media_stream_request.h
diff --git a/content/public/common/media_stream_request.h b/content/public/common/media_stream_request.h
index d29a809cde06e0c197e592ca897e0e9c93149a49..5ff24e250fef74fa477e2369e4d64ce6979f8dc7 100644
--- a/content/public/common/media_stream_request.h
+++ b/content/public/common/media_stream_request.h
@@ -53,6 +53,13 @@ struct CONTENT_EXPORT MediaStreamDevice {
       const std::string& id,
       const std::string& name);
 
+  MediaStreamDevice(
+      MediaStreamType type,
+      const std::string& id,
+      const std::string& name,
+      int sample_rate,
+      int channel_layout);
+
   ~MediaStreamDevice();
 
   // The device's type.
@@ -63,6 +70,18 @@ struct CONTENT_EXPORT MediaStreamDevice {
 
   // The device's "friendly" name. Not guaranteed to be unique.
   std::string name;
+
+  // Preferred sample rate in samples per second for the device.
+  // Only utilized for audio devices. Will be set to 0 if the constructor
+  // with three parameters (intended for video) is used.

[jam, 2013/01/16 17:57:24]

nit: here and below, I would skip this comment since it's needless. if someone
wants to see the default values, they can find it easily

+  int sample_rate;
+
+  // Preferred channel configuration for the device.
+  // Only utilized for audio devices. Will be set to 0 if the constructor
+  // with three parameters (intended for video) is used.
+  // TODO(henrika): ideally, we would like to use media::ChannelLayout here
+  // but including media/base/channel_layout.h violates checkdeps rules.
+  int channel_layout;
 };
 
 typedef std::vector<MediaStreamDevice> MediaStreamDevices;