Add SoundContentSetting to about_flags. Also add Sound to site_details
page.

Bug: 743001
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I43092e0bc7861d62c87851e2c15f127ca3f49a18
Reviewed-on: https://chromium-review.googlesource.com/633464
Reviewed-by: Tommy Li <[email protected]>
Reviewed-by: Mounir Lamouri <[email protected]>
Reviewed-by: Yuri Wiitala <[email protected]>
Commit-Queue: Tommy Steimel <[email protected]>
Cr-Commit-Position: refs/heads/master@{#497897}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 4cc4f78a4..bbfedbb7 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -3401,6 +3401,12 @@
      FEATURE_VALUE_TYPE(features::kDoodlesOnLocalNtp)},
 #endif  // !defined(OS_ANDROID)
 
+#if !defined(OS_ANDROID)
+    {"sound-content-setting", flag_descriptions::kSoundContentSettingName,
+     flag_descriptions::kSoundContentSettingDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kSoundContentSetting)},
+#endif  // !defined(OS_ANDROID)
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms/enums.xml. See note in
     // enums.xml and don't forget to run AboutFlagsHistogramTest unit test.