[Harmony Cast Dialog] Show issue text in sink button

If there is an issue associated with a sink, use the issue text as the
status text for the sink.

Bug: 874625
Change-Id: I2dd844a851cc58828047dd3305b3fd729ba514e0
Reviewed-on: https://chromium-review.googlesource.com/1176473Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583459}

chrome/browser/ui/views/media_router/cast_dialog_sink_button.cc

@@ -92,6 +92,8 @@ std::unique_ptr<views::View> CreateSecondaryIconForSink(
 }
 
 base::string16 GetStatusTextForSink(const UIMediaSink& sink) {
+  if (sink.issue)
+    return base::UTF8ToUTF16(sink.issue->info().title);
   if (!sink.status_text.empty())
     return sink.status_text;
   switch (sink.state) {