Added support for multiple sampling rates on Windows.

remoting/host/audio_capturer.h

Index: remoting/host/audio_capturer.h
diff --git a/remoting/host/audio_capturer.h b/remoting/host/audio_capturer.h
index 87fa8ab7875f744ce98dcc2ca3d5dece9d3c6245..1c456c14ce8a666b3c1696205430153506b4d1bd 100644
--- a/remoting/host/audio_capturer.h
+++ b/remoting/host/audio_capturer.h
@@ -7,10 +7,11 @@
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
-#include "remoting/proto/audio.pb.h"
 
 namespace remoting {
 
+class AudioPacket;
+
 class AudioCapturer {
  public:
   typedef base::Callback<void(scoped_ptr<AudioPacket> packet)>
@@ -20,8 +21,8 @@ class AudioCapturer {
 
   static scoped_ptr<AudioCapturer> Create();
 
-  // Capturers should sample at a 44.1 kHz sampling rate, in uncompressed PCM
-  // stereo format. Capturers may choose the number of frames per packet.
+  // Capturers should sample at a 44.1 or 48 kHz sampling rate, in uncompressed
+  // PCM stereo format. Capturers may choose the number of frames per packet.
   // Returns true on success.
   virtual bool Start(const PacketCapturedCallback& callback) = 0;
   // Stops the audio capturer, and frees the OS-specific audio capture
@@ -29,6 +30,8 @@ class AudioCapturer {
   virtual void Stop() = 0;
   // Returns true if the audio capturer is running.
   virtual bool IsRunning() = 0;
+
+  static bool IsValidSampleRate(int sample_rate);
 };
 
 }  // namespace remoting