Limit extension autoupdates timer maximum scheduled delay.

chrome/browser/extensions/updater/extension_updater.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/updater/extension_updater.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 175 matching lines @@
   } else if (days >= 14) {
     // Wait 10-20 minutes.
     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds * 2,
                                           kStartupWaitSeconds * 4));
   } else if (days >= 3) {
     // Wait 20-40 minutes.
     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds * 4,
                                           kStartupWaitSeconds * 8));
   }
 
-  // Read the persisted next check time, and use that if it isn't too soon.
-  // Otherwise pick something random.
+  // Read the persisted next check time, and use that if it isn't too soon
+  // or too late. Otherwise pick something random.
   Time saved_next = Time::FromInternalValue(prefs_->GetInt64(
       pref_names::kNextUpdateCheck));
   Time earliest = now + TimeDelta::FromSeconds(kStartupWaitSeconds);
-  if (saved_next >= earliest) {
+  Time latest = now + TimeDelta::FromSeconds(frequency_seconds_);
+  if (saved_next >= earliest && saved_next <= latest) {
     return saved_next - now;
   } else {
     return TimeDelta::FromSeconds(RandInt(kStartupWaitSeconds,
                                           frequency_seconds_));
   }
 }
 
 void ExtensionUpdater::Start() {
   DCHECK(!alive_);
   // If these are NULL, then that means we've been called after Stop()
@@ skipping 431 matching lines @@
   const InProgressCheck& request = requests_in_progress_[request_id];
   if (request.in_progress_ids_.empty()) {
     VLOG(2) << "Finished update check " << request_id;
     if (!request.callback.is_null())
       request.callback.Run();
     requests_in_progress_.erase(request_id);
   }
 }
 
 }  // namespace extensions