Offline Page Cache uses user interaction triggers for saving pages.

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 9bab239054c68ffa8f99cbfe64b90df9ed9c6279..e14237842c5de8a32213ef71e469303e13ffca40 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -13940,7 +13940,7 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
       </message>
       <message name="IDS_DESKTOP_MEDIA_PICKER_AUDIO_SHARE" desc="Text for the checkbox on the window picker dialog, when checked, audio will be shared, otherwise just video sharing">
         Share audio
-      </message>      
+      </message>
       <message name="IDS_DESKTOP_MEDIA_PICKER_SOURCE_TYPE_SCREEN" desc="Text for the button on the window picker dialog, clicking which takes one to full screen sharing">
         Your Entire Screen
       </message>
@@ -15221,6 +15221,12 @@ Please check your email at <ph name="ACCOUNT_EMAIL">$2<ex>jane.doe@gmail.com</ex
       <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>
+      <message name="IDS_FLAGS_OFFLINING_USES_NAVIGATION_TRIGGERS_NAME" desc="Name for the flag that makes offlining of recently visited pages use navigation triggers.">
+        Enable the usage of navigation triggers for offlining recently visited pages
+      </message>
+      <message name="IDS_FLAGS_OFFLINING_USES_NAVIGATION_TRIGGERS_DESCRIPTION" desc="Description for the flag that makes offlining of recently visited pages use navigation triggers.">
+        Sets the offlining of recently visited pages feature to create snapshots based on navigation triggers. When disabled user interaction events will be used instead.
+      </message>
       <message name="IDS_FLAGS_OFFLINE_PAGES_CT_NAME" desc="Name for the flag to enable offlining CT features.">
         Enable Offline Pages CT features.
       </message>