Add unit test for UsbChooserController

device/usb/mock_usb_device.h

Index: device/usb/mock_usb_device.h
diff --git a/device/usb/mock_usb_device.h b/device/usb/mock_usb_device.h
index 6c6241a5ad0ca9d04a220eb8ab4a87861cd5d437..a9a6cd0ca6f32fa5234d5e85f8891c5df7784968 100644
--- a/device/usb/mock_usb_device.h
+++ b/device/usb/mock_usb_device.h
@@ -7,11 +7,13 @@
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "device/usb/usb_device.h"
 #include "device/usb/usb_device_handle.h"
+#include "device/usb/webusb_descriptors.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace device {
@@ -44,6 +46,11 @@ class MockUsbDevice : public UsbDevice {
 
   void AddMockConfig(const UsbConfigDescriptor& config);
 
+  void set_webusb_allowed_origins(
+      std::unique_ptr<WebUsbAllowedOrigins> webusb_allowed_origins) {
+    webusb_allowed_origins_ = std::move(webusb_allowed_origins);
+  }
+
   // Public wrappers around protected functions.
   void ActiveConfigurationChanged(int configuration_value);
   void NotifyDeviceRemoved();