Add category tag for media app feedback reports.

The media app now has a bucket for feedback (see b/139318556 for more
detail).

This CL adds this bucket id to our invocation of the feedback dialog so
our reports end up in the right place.

Bug: 996088, b/139318556
Change-Id: I30c9cd828c5f71e36f5d45b0603ea8e46b6fcabb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137170Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Zain Afzal <zafzal@google.com>
Cr-Commit-Position: refs/heads/master@{#756916}

chrome/browser/chromeos/web_applications/chrome_media_app_ui_delegate.cc

@@ -14,15 +14,18 @@ ChromeMediaAppUIDelegate::ChromeMediaAppUIDelegate(content::WebUI* web_ui)
 
 base::Optional<std::string> ChromeMediaAppUIDelegate::OpenFeedbackDialog() {
   Profile* profile = Profile::FromWebUI(web_ui_);
+  constexpr char kMediaAppFeedbackCategoryTag[] = "FromMediaApp";
+
   // TODO(crbug/1045222): Additional strings are blank right now while we decide
   // on the language and relevant information we want feedback to include.
   // Note that category_tag is the name of the listnr bucket we want our
-  // reports to end up in. I.e DESKTOP_TAB_GROUPS.
-  chrome::ShowFeedbackPage(
-      GURL(chromeos::kChromeUIMediaAppURL), profile,
-      chrome::kFeedbackSourceMediaApp, std::string() /* description_template */,
-      std::string() /* description_placeholder_text */,
-      std::string() /* category_tag */, std::string() /* extra_diagnostics */);
+  // reports to end up in.
+  chrome::ShowFeedbackPage(GURL(chromeos::kChromeUIMediaAppURL), profile,
+                           chrome::kFeedbackSourceMediaApp,
+                           std::string() /* description_template */,
+                           std::string() /* description_placeholder_text */,
+                           kMediaAppFeedbackCategoryTag /* category_tag */,
+                           std::string() /* extra_diagnostics */);
 
   // TODO(crbug/1048368): Showing the feedback dialog can fail, communicate this
   // back to the client with an error string. For now assume dialog opened.