Add functions to let tests read and control the Bluetooth chooser state.

components/html_viewer/web_test_delegate_impl.h

Index: components/html_viewer/web_test_delegate_impl.h
diff --git a/components/html_viewer/web_test_delegate_impl.h b/components/html_viewer/web_test_delegate_impl.h
index b48a6bdf714facb74dc93c6aab95a32eb58ce1a9..d6ed8918110488d98bfba8710764bf85ff2228da 100644
--- a/components/html_viewer/web_test_delegate_impl.h
+++ b/components/html_viewer/web_test_delegate_impl.h
@@ -70,6 +70,10 @@ class WebTestDelegateImpl : public test_runner::WebTestDelegate {
   void SetDeviceScaleFactor(float factor) override;
   void SetDeviceColorProfile(const std::string& name) override;
   void SetBluetoothMockDataSet(const std::string& data_set) override;
+  void SetBluetoothManualChooser() override;
+  std::vector<std::string> GetBluetoothManualChooserEvents() override;
+  void SendBluetoothManualChooserEvent(const std::string& event,
+                                       const std::string& argument) override;
   void SetGeofencingMockProvider(bool service_available) override;
   void ClearGeofencingMockProvider() override;
   void SetGeofencingMockPosition(double latitude, double longitude) override;