Improve audible token detection.

components/copresence/public/whispernet_client.h

Index: components/copresence/public/whispernet_client.h
diff --git a/components/copresence/public/whispernet_client.h b/components/copresence/public/whispernet_client.h
index 6926fff692720d45d98ae00d80ccac09dc827141..e800d85edc8bada536293f98928f751b3197169b 100644
--- a/components/copresence/public/whispernet_client.h
+++ b/components/copresence/public/whispernet_client.h
@@ -18,6 +18,13 @@ class AudioBusRefCounted;
 
 namespace copresence {
 
+struct FullToken {
+  FullToken(const std::string& token, bool audible)
+      : token(token), audible(audible) {}
+  std::string token;
+  bool audible;
+};
+
 // The interface that the whispernet client needs to implement. These methods
 // provide us the ability to use the audio medium in copresence. Currently since
 // the only medium that copresence uses is audio, the implementation of this
@@ -27,10 +34,11 @@ class WhispernetClient {
   // Generic callback to indicate a boolean success or failure.
   typedef base::Callback<void(bool)> SuccessCallback;
   // Callback that returns detected tokens.
-  typedef base::Callback<void(const std::vector<std::string>&)> TokensCallback;
+  typedef base::Callback<void(const std::vector<FullToken>&)> TokensCallback;
   // Callback that returns encoded samples for a given token.
-  typedef base::Callback<
-      void(const std::string&, const scoped_refptr<media::AudioBusRefCounted>&)>
+  typedef base::Callback<void(const std::string&,
+                              bool,
+                              const scoped_refptr<media::AudioBusRefCounted>&)>
       SamplesCallback;
 
   // Initialize the whispernet client and call the callback when done. The