[Android] Add an about flag for Download Manager UI

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 73bf0dd49b21f5d17627947a9d94a02fe34998fa..93ac04058f2a88d9f1a9ac7a6e910793e6e42b48 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1286,6 +1286,9 @@ const FeatureEntry kFeatureEntries[] = {
     {"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,
@@ -2049,8 +2052,8 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_QUICK_UNLOCK_PIN_DESCRIPTION, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kQuickUnlockPin)},
 #endif  // defined(OS_CHROMEOS)
-    // NOTE: Adding new command-line switches requires adding corresponding
-    // entries to enum "LoginCustomFlags" in histograms.xml. See note in
+        // NOTE: Adding new command-line switches requires adding corresponding

[gone, 2016/08/09 21:00:29]

nit: Remove extra space

+        // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };