RB-B P1 issue: Add debug aliases for state_ and urls to debug CHECK failures

chrome/browser/loader/safe_browsing_resource_throttle.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/loader/safe_browsing_resource_throttle.h"
 
 #include <iterator>
 #include <utility>
 
+#include "base/debug/alias.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "components/safe_browsing_db/util.h"
 #include "components/safe_browsing_db/v4_feature_list.h"
 #include "components/safe_browsing_db/v4_local_database_manager.h"
@@ skipping 206 matching lines @@
   return "SafeBrowsingResourceThrottle";
 }
 
 // SafeBrowsingService::Client implementation, called on the IO thread once
 // the URL has been classified.
 void SafeBrowsingResourceThrottle::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());
-  CHECK_EQ(url, url_being_checked_);
+  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());
+    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);
   }
   EndNetLogEvent(
       NetLogEventType::SAFE_BROWSING_CHECKING_URL, "result",
@@ skipping 180 matching lines @@
                        unchecked_redirect_url_, "defer_reason",
                        "resumed_redirect");
     }
   }
 
   if (resume) {
     defer_state_ = DEFERRED_NONE;
     controller()->Resume();
   }
 }