[Media Router] Implement JoinRoute + update CreateRoute API.

chrome/browser/media/router/test_helper.h

Index: chrome/browser/media/router/test_helper.h
diff --git a/chrome/browser/media/router/test_helper.h b/chrome/browser/media/router/test_helper.h
index f7cca19248abfafe9d5e6a3bc82cfaee6b22a014..10b79264323d20e2ade05a907acd5a5cbf271393 100644
--- a/chrome/browser/media/router/test_helper.h
+++ b/chrome/browser/media/router/test_helper.h
@@ -41,10 +41,19 @@ class MockMojoMediaRouterService : public interfaces::MediaRouter {
   MockMojoMediaRouterService();
   ~MockMojoMediaRouterService() override;
 
-  MOCK_METHOD3(CreateRoute,
-               void(const mojo::String& source,
+  MOCK_METHOD6(CreateRoute,
+               void(const mojo::String& source_urn,
                     const mojo::String& sink_id,
+                    const mojo::String& presentation_id,
+                    const mojo::String& origin,
+                    int tab_id,
                     const CreateRouteCallback& callback));
+  MOCK_METHOD5(JoinRoute,
+               void(const mojo::String& source_urn,
+                    const mojo::String& presentation_id,
+                    const mojo::String& origin,
+                    int tab_id,
+                    const JoinRouteCallback& callback));
   MOCK_METHOD1(CloseRoute, void(const mojo::String& route_id));
   MOCK_METHOD1(StartObservingMediaSinks, void(const mojo::String& source));
   MOCK_METHOD1(StopObservingMediaSinks, void(const mojo::String& source));