[Media Router] Add ProvideSinks() Mojo API

chrome/browser/media/router/mojo/media_router_mojo_test.h

Index: chrome/browser/media/router/mojo/media_router_mojo_test.h
diff --git a/chrome/browser/media/router/mojo/media_router_mojo_test.h b/chrome/browser/media/router/mojo/media_router_mojo_test.h
index 72609c897287e29047a4bb6de154e154f6e61f6f..16f01818d53331fe5c2760c55d90d73d7de000c5 100644
--- a/chrome/browser/media/router/mojo/media_router_mojo_test.h
+++ b/chrome/browser/media/router/mojo/media_router_mojo_test.h
@@ -97,6 +97,12 @@ class MockMediaRouteProvider : public mojom::MediaRouteProvider {
                     const std::string& media_source,
                     mojom::SinkSearchCriteriaPtr& search_criteria,
                     const SearchSinksCallback& callback));
+  void OnSinksDiscovered(
+      std::vector<std::unique_ptr<MediaSink>> sinks) override {
+    OnSinksDiscovered_(sinks);
+  }
+  MOCK_METHOD1(OnSinksDiscovered_,
+               void(const std::vector<std::unique_ptr<MediaSink>>& sinks));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockMediaRouteProvider);