Redesign the copresence audio handlers.

chrome/browser/copresence/chrome_whispernet_client.h

Index: chrome/browser/copresence/chrome_whispernet_client.h
diff --git a/chrome/browser/copresence/chrome_whispernet_client.h b/chrome/browser/copresence/chrome_whispernet_client.h
index 4edcae5f7eb275e1c3a45dea9e42373ab59f2f52..9c0bd99761080c4a1bef1e9ef6d0ae142ec7d45f 100644
--- a/chrome/browser/copresence/chrome_whispernet_client.h
+++ b/chrome/browser/copresence/chrome_whispernet_client.h
@@ -10,6 +10,7 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
+#include "components/copresence/public/copresence_constants.h"
 #include "components/copresence/public/whispernet_client.h"
 
 namespace content {
@@ -30,7 +31,7 @@ class AudioBusRefCounted;
 
 // This class is responsible for communication with our ledger_proxy extension
 // that talks to the whispernet audio library.
-class ChromeWhispernetClient : public copresence::WhispernetClient {
+class ChromeWhispernetClient final : public copresence::WhispernetClient {
  public:
   // The browser context needs to outlive this class.
   explicit ChromeWhispernetClient(content::BrowserContext* browser_context);
@@ -40,8 +41,10 @@ class ChromeWhispernetClient : public copresence::WhispernetClient {
   virtual void Initialize(const SuccessCallback& init_callback) override;
   virtual void Shutdown() override;
 
-  virtual void EncodeToken(const std::string& token, bool audible) override;
-  virtual void DecodeSamples(const std::string& samples) override;
+  virtual void EncodeToken(const std::string& token,
+                           copresence::AudioType type) override;
+  virtual void DecodeSamples(copresence::AudioType type,
+                             const std::string& samples) override;
   virtual void DetectBroadcast() override;
 
   virtual void RegisterTokensCallback(