cros: Fix various small issues with cast tray entry.

ash/common/system/chromeos/cast/tray_cast.cc

Index: ash/common/system/chromeos/cast/tray_cast.cc
diff --git a/ash/common/system/chromeos/cast/tray_cast.cc b/ash/common/system/chromeos/cast/tray_cast.cc
index 9352de412a996f7a52fb1beae0f0676017f868ec..be5df751677372def109e8cb82db7a83c2f3c685 100644
--- a/ash/common/system/chromeos/cast/tray_cast.cc
+++ b/ash/common/system/chromeos/cast/tray_cast.cc
@@ -160,7 +160,9 @@ void CastCastView::UpdateLabel(
     const mojom::CastSinkPtr& sink = i->sink;
     const mojom::CastRoutePtr& route = i->route;
 
-    if (!route->id.empty()) {
+    // We only want to display casts that came from this machine, since on a
+    // busy network many other people could be casting.
+    if (!route->id.empty() && route->is_local_source) {
       displayed_route_ = route.Clone();
 
       // We want to display different labels inside of the title depending on
@@ -170,27 +172,34 @@ void CastCastView::UpdateLabel(
         case ash::mojom::ContentSource::UNKNOWN:
           label()->SetText(
               l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_CAST_CAST_UNKNOWN));
+          stop_button()->SetAccessibleName(l10n_util::GetStringUTF16(
+              IDS_ASH_STATUS_TRAY_CAST_CAST_UNKNOWN_ACCESSIBILITY_STOP));
           break;
         case ash::mojom::ContentSource::TAB:
           label()->SetText(ElideString(l10n_util::GetStringFUTF16(
               IDS_ASH_STATUS_TRAY_CAST_CAST_TAB,
               base::UTF8ToUTF16(route->title), base::UTF8ToUTF16(sink->name))));
+          stop_button()->SetAccessibleName(
+              ElideString(l10n_util::GetStringFUTF16(
+                  IDS_ASH_STATUS_TRAY_CAST_CAST_TAB_ACCESSIBILITY_STOP,
+                  base::UTF8ToUTF16(route->title),
+                  base::UTF8ToUTF16(sink->name))));
           break;
         case ash::mojom::ContentSource::DESKTOP:
           label()->SetText(ElideString(
               l10n_util::GetStringFUTF16(IDS_ASH_STATUS_TRAY_CAST_CAST_DESKTOP,
                                          base::UTF8ToUTF16(sink->name))));
+          stop_button()->SetAccessibleName(
+              ElideString(l10n_util::GetStringFUTF16(
+                  IDS_ASH_STATUS_TRAY_CAST_CAST_DESKTOP_ACCESSIBILITY_STOP,
+                  base::UTF8ToUTF16(sink->name))));
           break;
       }
 
       PreferredSizeChanged();
       Layout();
-
-      // If this machine is the source of the activity, then we want to display
-      // it over any other activity. There can be multiple activities if other
-      // devices on the network are casting at the same time.
-      if (route->is_local_source)
-        break;
+      // Only need to update labels once.
+      break;
     }
   }
 }
@@ -547,11 +556,8 @@ void TrayCast::UpdatePrimaryView() {
 }
 
 bool TrayCast::HasActiveRoute() {
-  if (is_mirror_casting_)
-    return true;
-
   for (const auto& sr : sinks_and_routes_) {
-    if (!sr->route->title.empty())
+    if (!sr->route->title.empty() && sr->route->is_local_source)
       return true;
   }