[MediaRouter]Wires up issue manager in MediaRouterMojoImpl.

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 ba5a47787e8b624aedce8884dd3ec92ac5c56e6a..e889543ebfc8af8cf26878986a113cbf9aa65998 100644
--- a/chrome/browser/media/router/test_helper.h
+++ b/chrome/browser/media/router/test_helper.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "chrome/browser/media/router/issues_observer.h"
 #include "chrome/browser/media/router/media_router.mojom.h"
 #include "chrome/browser/media/router/media_router_mojo_impl.h"
 #include "chrome/browser/media/router/media_routes_observer.h"
@@ -36,6 +37,14 @@ MATCHER_P(SequenceEquals, other, "") {
   return true;
 }
 
+class MockIssuesObserver : public IssuesObserver {
+ public:
+  MockIssuesObserver(MediaRouter* router);
+  ~MockIssuesObserver() override;
+
+  MOCK_METHOD1(OnIssueUpdated, void(const Issue* issue));
+};
+
 class MockMediaRouteProvider : public interfaces::MediaRouteProvider {
  public:
   MockMediaRouteProvider();