Add polling and audio check to copresence.

components/copresence/test/stub_whispernet_client.h

Index: components/copresence/test/stub_whispernet_client.h
diff --git a/components/copresence/test/stub_whispernet_client.h b/components/copresence/test/stub_whispernet_client.h
index 6975e76ba215e47f787670907135275db3a99659..824ac853db8769177c53f9d64a933d4c14b04cd8 100644
--- a/components/copresence/test/stub_whispernet_client.h
+++ b/components/copresence/test/stub_whispernet_client.h
@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_COPRESENCE_TEST_STUB_WHISPERNET_CLIENT_H_
 #define COMPONENTS_COPRESENCE_TEST_STUB_WHISPERNET_CLIENT_H_
 
+#include "base/callback.h"
+
 #include "components/copresence/public/whispernet_client.h"
 
 namespace copresence {
@@ -12,25 +14,26 @@ namespace copresence {
 // An empty WhispernetClient for testing.
 class StubWhispernetClient final : public WhispernetClient {
  public:
-  StubWhispernetClient() {}
+  StubWhispernetClient();
+  ~StubWhispernetClient() override;
 
-  void Initialize(const SuccessCallback& /* init_callback */) override {}
+  void Initialize(const SuccessCallback& /* init_cb */) override {}
   void Shutdown() override {}
-  void EncodeToken(const std::string& /* token */, AudioType /* type */)
-      override {}
-  void DecodeSamples(AudioType /* type */, const std::string& /* samples */)
-      override {}
+  void EncodeToken(const std::string& token, AudioType type) override;
+  void DecodeSamples(AudioType type, const std::string& samples) override;
   void DetectBroadcast() override {}
-  void RegisterTokensCallback(
-      const TokensCallback& /* tokens_callback */) override {}
-  void RegisterSamplesCallback(
-      const SamplesCallback& /* samples_callback */) override {}
+  void RegisterTokensCallback(const TokensCallback& tokens_cb) override;
+  void RegisterSamplesCallback(const SamplesCallback& samples_cb) override;
   void RegisterDetectBroadcastCallback(
-      const SuccessCallback& /* db_callback */) override {}
+      const SuccessCallback& /* db_cb */) override {}
   TokensCallback GetTokensCallback() override;
   SamplesCallback GetSamplesCallback() override;
   SuccessCallback GetDetectBroadcastCallback() override;
   SuccessCallback GetInitializedCallback() override;
+
+ private:
+  TokensCallback tokens_cb_;
+  SamplesCallback samples_cb_;
 };
 
 }  // namespace copresence