[Android] Add an about flag for Download Manager UI

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1268 matching lines @@
     {"reset-app-list-install-state",
      IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_NAME,
      IDS_FLAGS_RESET_APP_LIST_INSTALL_STATE_DESCRIPTION,
      kOsMac | kOsWin | kOsLinux,
      SINGLE_VALUE_TYPE(app_list::switches::kResetAppListInstallState)},
 #endif
 #if defined(OS_ANDROID)
     {"enable-all-bookmarks-view", IDS_FLAGS_ENABLE_ALL_BOOKMARKS_VIEW_NAME,
      IDS_FLAGS_SHOW_ALL_BOOKMARKS_VIEW_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kAllBookmarksFeature)},
+    {"enable-downloads-ui", IDS_FLAGS_ENABLE_DOWNLOADS_UI_NAME,
+        IDS_FLAGS_ENABLE_DOWNLOADS_UI_DESCRIPTION, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kDownloadsUiFeature)},
     {"enable-accessibility-tab-switcher",
      IDS_FLAGS_ACCESSIBILITY_TAB_SWITCHER_NAME,
      IDS_FLAGS_ACCESSIBILITY_TAB_SWITCHER_DESCRIPTION, kOsAndroid,
      SINGLE_VALUE_TYPE(switches::kEnableAccessibilityTabSwitcher)},
     {"enable-physical-web", IDS_FLAGS_ENABLE_PHYSICAL_WEB_NAME,
      IDS_FLAGS_ENABLE_PHYSICAL_WEB_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kPhysicalWebFeature)},
 #endif
     {"enable-zero-copy", IDS_FLAGS_ZERO_COPY_NAME,
      IDS_FLAGS_ZERO_COPY_DESCRIPTION, kOsAll,
@@ skipping 933 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags