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

chrome/browser/media/defer_background_media_browsertest.cc

 // Copyright 2015 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 "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
-#include "content/public/common/content_switches.h"
 #include "content/public/test/browser_test_utils.h"
+#include "media/base/media_switches.h"
 #include "media/base/test_data_util.h"
 
 class DeferredMediaBrowserTest : public InProcessBrowserTest {
  public:
 #if defined(OS_ANDROID)
   void SetUpCommandLine(base::CommandLine* command_line) override {
-    command_line->AppendSwitch(
-        switches::kDisableGestureRequirementForMediaPlayback);
+    command_line->AppendSwitch(switches::kIgnoreAutoplayRestrictionsForTests);
   }
 #endif
 };
 
 IN_PROC_BROWSER_TEST_F(DeferredMediaBrowserTest, BackgroundMediaIsDeferred) {
   // Navigate to a video file, which would autoplay in the foreground, but won't
   // in the background due to deferred media loading for hidden tabs.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(), content::GetFileUrlWithQuery(
                      media::GetTestDataFilePath("bear-640x360.webm"), ""),
@@ skipping 26 matching lines @@
   EXPECT_EQ(background_contents,
             browser()->tab_strip_model()->GetActiveWebContents());
 
   // If everything worked, we should see "playing" and not "ended".
   const base::string16 playing_str = base::UTF8ToUTF16("playing");
   const base::string16 ended_str = base::UTF8ToUTF16("ended");
   content::TitleWatcher watcher(background_contents, playing_str);
   watcher.AlsoWaitForTitle(ended_str);
   EXPECT_EQ(playing_str, watcher.WaitAndGetTitle());
 }