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

chrome/android/BUILD.gn

 # 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.
 
 import("//android_webview/webview_repack_locales_list.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/util/process_version.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/android/monochrome_android_manifest_jinja_variables.gni")
@@ skipping 437 matching lines @@
     "//components/sync:sync_java_test_support",
     "//components/sync/android:sync_java",
     "//components/sync/android:sync_javatests",
     "//components/url_formatter/android:url_formatter_java",
     "//components/web_contents_delegate_android:web_contents_delegate_android_java",
     "//components/web_restrictions:web_restrictions_java",
     "//content/public/android:content_java",
     "//content/public/test/android:content_java_test_support",
     "//device/geolocation:geolocation_java",
     "//device/geolocation:geolocation_java_test_support",
+    "//media/base/android:media_java",
     "//mojo/public/java:bindings_java",
     "//mojo/public/java:system_java",
     "//net/android:net_java",
     "//net/android:net_java_test_support",
     "//printing:printing_java",
     "//third_party/WebKit/public:android_mojo_bindings_java",
     "//third_party/WebKit/public:blink_headers_java",
     "//third_party/WebKit/public:mojo_bindings_java",
     "//third_party/android_support_test_runner:rules_java",
     "//third_party/android_support_test_runner:runner_java",
@@ skipping 461 matching lines @@
   apk_name = "ChromeSyncShellTest"
   apk_under_test = ":chrome_sync_shell_apk"
   android_manifest = chrome_sync_shell_test_apk_manifest
   android_manifest_dep = ":chrome_sync_shell_test_apk_manifest"
   deps = [
     ":chrome_sync_shell_test_apk_java",
     "//third_party/android_support_test_runner:runner_java",
   ]
   proguard_enabled = !is_java_debug
 }