Add a source to V8 proxy resolver-initiated DNS requests,

net/proxy/proxy_resolver_js_bindings.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 "net/proxy/proxy_resolver_js_bindings.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/values.h"
@@ skipping 244 matching lines @@
       const HostCache::Entry* entry =
           host_cache->Lookup(cache_key, base::TimeTicks::Now());
       if (entry) {
         if (entry->error == OK)
           *address_list = entry->addrlist;
         return entry->error;
       }
     }
 
     // Otherwise ask the host resolver.
-    int result = host_resolver_->Resolve(info, address_list);
+    const BoundNetLog* net_log = GetNetLogForCurrentRequest();
+    int result = host_resolver_->Resolve(info,
+                                         address_list,
+                                         net_log ? *net_log : BoundNetLog());
 
     // Save the result back to the per-request DNS cache.
     if (host_cache) {
       host_cache->Set(cache_key, result, *address_list,
                       base::TimeTicks::Now(),
                       base::TimeDelta::FromSeconds(kCacheEntryTTLSeconds));
     }
 
     return result;
   }
 
+  // May return NULL.
+  const BoundNetLog* GetNetLogForCurrentRequest() {
+    if (!current_request_context())
+      return NULL;
+    return current_request_context()->net_log;
+  }
+
   void LogEventToCurrentRequest(
       NetLog::EventPhase phase,
       NetLog::EventType type,
       scoped_refptr<NetLog::EventParameters> params) {
-    if (current_request_context() && current_request_context()->net_log)
-      current_request_context()->net_log->AddEntry(type, phase, params);
+    const BoundNetLog* net_log = GetNetLogForCurrentRequest();
+    if (net_log)
+      net_log->AddEntry(type, phase, params);
   }
 
   void LogEventToCurrentRequestAndGlobally(
       NetLog::EventType type,
       scoped_refptr<NetLog::EventParameters> params) {
     LogEventToCurrentRequest(NetLog::PHASE_NONE, type, params);
 
     // Emit to the global NetLog event stream.
     if (net_log_) {
       net_log_->AddEntry(
@@ skipping 15 matching lines @@
 
 // static
 ProxyResolverJSBindings* ProxyResolverJSBindings::CreateDefault(
     SyncHostResolver* host_resolver,
     NetLog* net_log,
     ProxyResolverErrorObserver* error_observer) {
   return new DefaultJSBindings(host_resolver, net_log, error_observer);
 }
 
 }  // namespace net