Add enable-offlining-recent-pages feature switch.

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 6ec41ea83f5d8f4fe215c2ceac46b19f682c4455..bd69953fd44efbca9a3101b41fc7680865869493 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -43,6 +43,7 @@
 #include "components/flags_ui/flags_storage.h"
 #include "components/flags_ui/flags_ui_switches.h"
 #include "components/nacl/common/nacl_switches.h"
+#include "components/offline_pages/offline_page_feature.h"
 #include "components/offline_pages/offline_page_switches.h"
 #include "components/omnibox/browser/omnibox_switches.h"
 #include "components/password_manager/core/common/password_manager_features.h"
@@ -1799,6 +1800,12 @@ const FeatureEntry kFeatureEntries[] = {
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableImeThread,
                                switches::kDisableImeThread)},
 #endif  // defined(OS_ANDROID)
+#if defined(OS_ANDROID)
+    {"offlining-recent-pages", IDS_FLAGS_OFFLINING_RECENT_PAGES_NAME,

[jianli, 2016/03/08 00:48:57]

Do we still need this?

[Dmitry Titov, 2016/03/08 01:08:24]

I think so - that's what creates the entries in chrome://flags so users can
see/manage the features.

+     IDS_FLAGS_OFFLINING_RECENT_PAGES_DESCRIPTION, kOsAndroid,
+     FEATURE_VALUE_TYPE(offline_pages::kOffliningRecentPagesFeature)},
+#endif  // defined(OS_ANDROID)
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.