Allow ProxyConfigService to report "no configuration set"

net/proxy/polling_proxy_config_service.cc

 // Copyright (c) 2011 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/polling_proxy_config_service.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop_proxy.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
@@ skipping 103 matching lines @@
 
     if (!origin_loop_proxy_)
       return;  // Was orphaned (parent has already been destroyed).
 
     DCHECK(origin_loop_proxy_->BelongsToCurrentThread());
 
     if (!has_config_ || !last_config_.Equals(config)) {
       // If the configuration has changed, notify the observers.
       has_config_ = true;
       last_config_ = config;
-      FOR_EACH_OBSERVER(Observer, observers_, OnProxyConfigChanged(config));
+      FOR_EACH_OBSERVER(Observer, observers_,
+                        OnProxyConfigChanged(config,
+                                             ProxyConfigService::CONFIG_VALID));
     }
 
     if (poll_task_queued_)
       CheckForChangesNow();
   }
 
   void LazyInitializeOriginLoop() {
     // TODO(eroman): Really this should be done in the constructor, but right
     //               now chrome is constructing the ProxyConfigService on the
     //               UI thread so we can't cache the IO thread for the purpose
@@ skipping 20 matching lines @@
 };
 
 void PollingProxyConfigService::AddObserver(Observer* observer) {
   core_->AddObserver(observer);
 }
 
 void PollingProxyConfigService::RemoveObserver(Observer* observer) {
   core_->RemoveObserver(observer);
 }
 
-bool PollingProxyConfigService::GetLatestProxyConfig(ProxyConfig* config) {
-  return core_->GetLatestProxyConfig(config);
+ProxyConfigService::ConfigAvailability
+    PollingProxyConfigService::GetLatestProxyConfig(ProxyConfig* config) {
+  return core_->GetLatestProxyConfig(config) ? CONFIG_VALID : CONFIG_PENDING;
 }
 
 void PollingProxyConfigService::OnLazyPoll() {
   core_->OnLazyPoll();
 }
 
 PollingProxyConfigService::PollingProxyConfigService(
     base::TimeDelta poll_interval,
     GetConfigFunction get_config_func)
     : core_(new Core(poll_interval, get_config_func)) {
 }
 
 PollingProxyConfigService::~PollingProxyConfigService() {
   core_->Orphan();
 }
 
 void PollingProxyConfigService::CheckForChangesNow() {
   core_->CheckForChangesNow();
 }
 
 }  // namespace net