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

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 0a963d1a4ed28f1bc00619cb9caf989bb3bb6465..9f7498d467a32a32a30bb8f00c8df59b6969fd79 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -135,6 +135,8 @@
 #include "components/dom_distiller/core/dom_distiller_switches.h"
 #include "components/dom_distiller/core/url_constants.h"
 #include "components/error_page/common/error_page_switches.h"
+#include "components/feature_engagement_tracker/public/feature_constants.h"
+#include "components/feature_engagement_tracker/public/feature_list.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/metrics/call_stack_profile_collector.h"
 #include "components/metrics/client_info.h"
@@ -2612,6 +2614,9 @@ void ChromeContentBrowserClient::OverrideWebkitPrefs(
 
   web_prefs->video_fullscreen_detection_enabled =
       chrome::android::AppHooks::ShouldDetectVideoFullscreen();
+
+  web_prefs->enable_media_in_product_help = base::FeatureList::IsEnabled(
+      feature_engagement_tracker::kIPHMediaDownloadFeature);
 #endif  // defined(OS_ANDROID)
 
   for (size_t i = 0; i < extra_parts_.size(); ++i)