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

components/feature_engagement_tracker/public/feature_list.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_PUBLIC_FEATURE_LIST_H_
 #define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_PUBLIC_FEATURE_LIST_H_
 
 #include <vector>
 
 #include "base/feature_list.h"
@@ skipping 31 matching lines @@
         arraysize(base_feature##Variation), nullptr                  \
   }
 
 // Defines a flags_ui::FeatureEntry::FeatureParam for each feature.
 DEFINE_VARIATION_PARAM(kIPHDummyFeature, "IPH_Dummy");
 #if defined(OS_ANDROID)
 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
 
 // Defines the array of which features should be listed in the chrome://flags
 // UI to be able to select them alone for demo-mode. The features listed here
 // are possible to enable on their own in demo mode.
 constexpr flags_ui::FeatureEntry::FeatureVariation
     kIPHDemoModeChoiceVariations[] = {
 #if defined(OS_ANDROID)
         VARIATION_ENTRY(kIPHDataSaverPreviewFeature),
         VARIATION_ENTRY(kIPHDataSaverDetailFeature),
         VARIATION_ENTRY(kIPHDownloadPageFeature),
         VARIATION_ENTRY(kIPHDownloadHomeFeature),
+        VARIATION_ENTRY(kIPHMediaDownloadFeature),
 #else
         VARIATION_ENTRY(kIPHDummyFeature),  // Ensures non-empty array.
 #endif  // OS_ANDROID
 };
 
 #undef DEFINE_VARIATION_PARAM
 #undef VARIATION_ENTRY
 
 // Returns all the features that are in use for engagement tracking.
 FeatureVector GetAllFeatures();
 
 }  // namespace feature_engagement_tracker
 
 #endif  // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_PUBLIC_FEATURE_LIST_H_