Add enable-offlining-recent-pages feature switch.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 52dd6981dfce616059c002723446e102129d169c..3df8f54456232c146d4eff45288287537222144f 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -14595,6 +14595,16 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
         If enabled, InputConnection calls run on IME thread, and instead of keeping a replica editor, each InputConnection call will directly talk to renderer.
       </message>
     </if>
+
+    <if expr="is_android">
+      <message name="IDS_FLAGS_OFFLINING_RECENT_PAGES_NAME" desc="Name for the flag to enable offlining of recently visited pages.">
+        Enable offlining of recently visited pages
+      </message>
+      <message name="IDS_FLAGS_OFFLINING_RECENT_PAGES_DESCRIPTION" desc="Description for the flag to enable offlining of recently visited pages.">
+        Enable storing recently visited pages locally for offline use. Requires Offline Pages to be enabled.
+      </message>
+    </if>
+
     </messages>
   </release>
 </grit>