chrome/blink: Add functionality for in-product help for media elements.

components/feature_engagement_tracker/public/feature_list.h

Index: components/feature_engagement_tracker/public/feature_list.h
diff --git a/components/feature_engagement_tracker/public/feature_list.h b/components/feature_engagement_tracker/public/feature_list.h
index b944137de77a9bfcd958c888b01c14dd4e2c43bc..4971dec6cefafd334bc44a6c3f59a8bd689be980 100644
--- a/components/feature_engagement_tracker/public/feature_list.h
+++ b/components/feature_engagement_tracker/public/feature_list.h
@@ -49,6 +49,7 @@ DEFINE_VARIATION_PARAM(kIPHDataSaverPreviewFeature, "IPH_DataSaverPreview");
 DEFINE_VARIATION_PARAM(kIPHDataSaverDetailFeature, "IPH_DataSaverDetail");
 DEFINE_VARIATION_PARAM(kIPHDownloadPageFeature, "IPH_DownloadPage");
 DEFINE_VARIATION_PARAM(kIPHDownloadHomeFeature, "IPH_DownloadHome");
+DEFINE_VARIATION_PARAM(kIPHMediaDownloadFeature, "IPH_MediaDownload");
 #endif  // OS_ANDROID
 
 }  // namespace
@@ -63,6 +64,7 @@ constexpr flags_ui::FeatureEntry::FeatureVariation
         VARIATION_ENTRY(kIPHDataSaverDetailFeature),
         VARIATION_ENTRY(kIPHDownloadPageFeature),
         VARIATION_ENTRY(kIPHDownloadHomeFeature),
+        VARIATION_ENTRY(kIPHMediaDownloadFeature),
 #else
         VARIATION_ENTRY(kIPHDummyFeature),  // Ensures non-empty array.
 #endif  // OS_ANDROID