MediaRecorder: add and wire read {video,audio}BitsPerSecond props

third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl

Index: third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl
diff --git a/third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl b/third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl
index 67c9f6b0f56d712fc45e113a37ebec28b1a408ee..de21c361162ba51dcac4607cdf89f9398799ed44 100644
--- a/third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl
+++ b/third_party/WebKit/Source/modules/mediarecorder/MediaRecorder.idl
@@ -25,6 +25,8 @@ enum RecordingState { "inactive", "recording", "paused" };
     attribute EventHandler onresume;
     attribute EventHandler onerror;
     attribute boolean ignoreMutedMedia;
+    readonly attribute unsigned long videoBitsPerSecond;
+    readonly attribute unsigned long audioBitsPerSecond;
 
     [RaisesException] void start(optional long timeslice);
     [RaisesException] void stop();