Reland of name kDisableGestureRequirementForMediaPlayback and make it a test-only flag.

chrome/browser/android/voice_search_tab_helper.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/android/voice_search_tab_helper.h"
 
 #include "base/command_line.h"
 #include "components/google/core/browser/google_util.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
-#include "content/public/common/content_switches.h"
 #include "content/public/common/web_preferences.h"
+#include "media/base/media_switches.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(VoiceSearchTabHelper);
 
+// TODO(715588): this class shouldn't be playing with the user gesture
+// requirements like this.
 VoiceSearchTabHelper::VoiceSearchTabHelper(content::WebContents* contents)
     : content::WebContentsObserver(contents) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   gesture_requirement_for_playback_disabled_ =
-      base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kDisableGestureRequirementForMediaPlayback);
+      command_line->HasSwitch(switches::kIgnoreAutoplayRestrictionsForTests) ||
+      command_line->GetSwitchValueASCII(switches::kAutoplayPolicy) !=
+          switches::autoplay::kNoUserGestureRequiredPolicy;
 }
 
 VoiceSearchTabHelper::~VoiceSearchTabHelper() {
 }
 
 void VoiceSearchTabHelper::NavigationEntryCommitted(
     const content::LoadCommittedDetails& load_details) {
   // In the case where media autoplay has been disabled by default (e.g. in
   // performance media tests) do not update it based on navigation changes.
   if (gesture_requirement_for_playback_disabled_)
     return;
 
   content::RenderViewHost* host = web_contents()->GetRenderViewHost();
   content::WebPreferences prefs = host->GetWebkitPreferences();
 
   bool gesture_required =
       !google_util::IsGoogleSearchUrl(web_contents()->GetLastCommittedURL());
 
   if (gesture_required != prefs.user_gesture_required_for_media_playback) {
     // TODO(chrishtr): this is wrong. user_gesture_required_for_media_playback
     // will be reset the next time a preference changes.
     prefs.user_gesture_required_for_media_playback = gesture_required;
     host->UpdateWebkitPreferences(prefs);
   }
 }