Have a list of pending checks instead of pending clients

components/safe_browsing/base_safe_browsing_resource_throttle.cc

 // Copyright (c) 2017 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 "components/safe_browsing/base_safe_browsing_resource_throttle.h"
 
 #include <iterator>
 #include <utility>
 
 #include "base/debug/alias.h"
@@ skipping 220 matching lines @@
 void BaseSafeBrowsingResourceThrottle::OnCheckBrowseUrlResult(
     const GURL& url,
     safe_browsing::SBThreatType threat_type,
     const safe_browsing::ThreatMetadata& metadata) {
   CHECK_EQ(state_, STATE_CHECKING_URL);
   // TODO(vakh): The following base::debug::Alias() and CHECK calls should be
   // removed after http://crbug.com/660293 is fixed.
   CHECK(url.is_valid());
   CHECK(url_being_checked_.is_valid());
   if (url != url_being_checked_) {
-    char buf[2000];
-    snprintf(buf, sizeof(buf), "sbtr::ocbur:%s -- %s\n", url.spec().c_str(),
-             url_being_checked_.spec().c_str());
+    bool url_had_timed_out = timed_out_urls_.count(url) > 0;
+    char buf[1000];
+    snprintf(buf, sizeof(buf), "sbtr::ocbur:%d:%s -- %s\n", url_had_timed_out,
+             url.spec().c_str(), url_being_checked_.spec().c_str());
     base::debug::Alias(buf);
     CHECK(false) << "buf: " << buf;
   }
 
   timer_.Stop();  // Cancel the timeout timer.
   threat_type_ = threat_type;
   state_ = STATE_NONE;
 
   if (defer_state_ != DEFERRED_NONE) {
     EndNetLogEvent(NetLogEventType::SAFE_BROWSING_DEFERRED, nullptr, nullptr);
@@ skipping 152 matching lines @@
   return false;
 }
 
 void BaseSafeBrowsingResourceThrottle::OnCheckUrlTimeout() {
   CHECK_EQ(state_, STATE_CHECKING_URL);
 
   database_manager_->CancelCheck(this);
 
   OnCheckBrowseUrlResult(url_being_checked_, safe_browsing::SB_THREAT_TYPE_SAFE,
                          safe_browsing::ThreatMetadata());
+
+  timed_out_urls_.insert(url_being_checked_);
 }
 
 void BaseSafeBrowsingResourceThrottle::ResumeRequest() {
   CHECK_EQ(state_, STATE_NONE);
   CHECK_NE(defer_state_, DEFERRED_NONE);
 
   bool resume = true;
   if (defer_state_ == DEFERRED_UNCHECKED_REDIRECT) {
     // Save the redirect urls for possible malware detail reporting later.
     redirect_urls_.push_back(unchecked_redirect_url_);
     if (!CheckUrl(unchecked_redirect_url_)) {
       // We're now waiting for the unchecked_redirect_url_.
       defer_state_ = DEFERRED_REDIRECT;
       resume = false;
       BeginNetLogEvent(NetLogEventType::SAFE_BROWSING_DEFERRED,
                        unchecked_redirect_url_, "defer_reason",
                        "resumed_redirect");
     }
   }
 
   if (resume) {
     defer_state_ = DEFERRED_NONE;
     Resume();
   }
 }