Check three times for the loading of the page.

ios/chrome/browser/reading_list/reading_list_web_state_observer.mm

Index: ios/chrome/browser/reading_list/reading_list_web_state_observer.mm
diff --git a/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm b/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm
index c2dc319b6ade3c951ac61a2b4487d775073dc099..b4aa9c0983e0990ab5f7f49a9064cd8bef3b5f2b 100644
--- a/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm
+++ b/ios/chrome/browser/reading_list/reading_list_web_state_observer.mm
@@ -104,6 +104,7 @@ void ReadingListWebStateObserver::WebStateDestroyed() {
 void ReadingListWebStateObserver::StartCheckingProgress(
     const GURL& pending_url) {
   pending_url_ = pending_url;
+  try_number_ = 0;
   timer_.reset(new base::Timer(false, true));
   const base::TimeDelta kDelayUntilLoadingProgressIsChecked =
       base::TimeDelta::FromSeconds(1);
@@ -128,10 +129,15 @@ void ReadingListWebStateObserver::VerifyIfReadingListEntryStartedLoading() {
   if (!entry || entry->DistilledState() != ReadingListEntry::PROCESSED) {
     return;
   }
+  try_number_++;
   double progress = web_state()->GetLoadingProgress();
-  const double kMinimumExpectedProgress = 0.15;
-  if (progress < kMinimumExpectedProgress) {
+  const double kMinimumExpectedProgressPerStep = 0.25;
+  if (progress < try_number_ * kMinimumExpectedProgressPerStep) {
     reading_list::LoadReadingListDistilled(*entry, reading_list_model_,
                                            web_state());
   }
+  if (try_number_ >= 3) {
+    // Loading reached 75%, let the page finish normal loading.
+    timer_->Stop();
+  }
 }