Add pair_broker to FastPairMediator/FastPairSeeker

PiperOrigin-RevId: 538592398

fastpair/ui/mock_ui_broker.h

@@ -37,8 +37,7 @@ class MockUIBroker : public UIBroker {
     observers_.RemoveObserver(observer);
   }
 
-  void NotifyDiscoveryAction(const FastPairDevice& device,
-                             DiscoveryAction action) {
+  void NotifyDiscoveryAction(FastPairDevice& device, DiscoveryAction action) {
     for (auto& observer : observers_.GetObservers())
       observer->OnDiscoveryAction(device, action);
   }

fastpair/ui/ui_broker.h

@@ -31,7 +31,7 @@ class UIBroker {
   class Observer {
    public:
     virtual ~Observer() = default;
-    virtual void OnDiscoveryAction(const FastPairDevice& device,
+    virtual void OnDiscoveryAction(FastPairDevice& device,
                                    DiscoveryAction action) = 0;
   };
 

fastpair/ui/ui_broker_impl_test.cc

@@ -39,7 +39,7 @@ class UIBrokerImplTest : public ::testing::Test, public UIBroker::Observer {
     ui_broker_->AddObserver(this);
   }
 
-  void OnDiscoveryAction(const FastPairDevice& device,
+  void OnDiscoveryAction(FastPairDevice& device,
                          DiscoveryAction action) override {
     on_discovery_action_notified_ = true;
     discovery_action_ = action;