feedv2: show fetch schedule on internals page

Bug: 1044139
Change-Id: I5eb68cfb99aa5a849b1bde708e2c91b8a2fba43c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2350880
Commit-Queue: Dan H <harringtond@chromium.org>
Auto-Submit: Dan H <harringtond@chromium.org>
Reviewed-by: Ian Wells <iwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797275}

components/feed/core/v2/feed_stream.cc

@@ -411,6 +411,16 @@ std::string FeedStream::DumpStateForDebugging() {
   if (model_) {
     ss << "model loaded, " << model_->GetContentList().size() << " contents\n";
   }
+  RequestSchedule schedule = prefs::GetRequestSchedule(*profile_prefs_);
+  if (schedule.refresh_offsets.empty()) {
+    ss << "No request schedule\n";
+  } else {
+    ss << "Request schedule reference " << schedule.anchor_time << '\n';
+    for (base::TimeDelta entry : schedule.refresh_offsets) {
+      ss << " fetch at " << entry << '\n';
+    }
+  }
+
   return ss.str();
 }