Replace Increment/DecrementKeepAliveCount by ScopedKeepAlives

chrome/browser/lifetime/keep_alive_registry.cc

 // Copyright 2016 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/lifetime/keep_alive_registry.h"
 
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/lifetime/keep_alive_state_observer.h"
 #include "chrome/browser/lifetime/keep_alive_types.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 // Public methods
 
 // static
 KeepAliveRegistry* KeepAliveRegistry::GetInstance() {
   return base::Singleton<KeepAliveRegistry>::get();
@@ skipping 15 matching lines @@
   observers_.RemoveObserver(observer);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Private methods
 
 KeepAliveRegistry::KeepAliveRegistry()
     : registered_count_(0), restart_allowed_count_(0) {}
 
 KeepAliveRegistry::~KeepAliveRegistry() {
-  DCHECK_EQ(0, registered_count_);
-  DCHECK_EQ(0u, registered_keep_alives_.size());
-  DCHECK_EQ(0, restart_allowed_count_);
+  DLOG_IF(ERROR, registered_count_ > 0 || registered_keep_alives_.size() > 0)
+      << "KeepAliveRegistry not empty at destruction time. State: " << *this;
 }
 
 void KeepAliveRegistry::Register(KeepAliveOrigin origin,
                                  KeepAliveRestartOption restart) {
   bool old_keeping_alive = IsKeepingAlive();
   bool old_restart_allowed = IsRestartAllowed();
 
   ++registered_keep_alives_[origin];
   ++registered_count_;
 
@@ skipping 34 matching lines @@
   if (new_restart_allowed != old_restart_allowed)
     OnRestartAllowedChanged(new_restart_allowed);
 
   if (new_keeping_alive != old_keeping_alive)
     OnKeepingAliveChanged(new_keeping_alive);
 
   DVLOG(1) << "New state of the KeepAliveRegistry: " << *this;
 }
 
 void KeepAliveRegistry::OnKeepingAliveChanged(bool new_keeping_alive) {
+  // Although we should have a browser process, if there is none,
+  // there is nothing to do.
+  if (!g_browser_process)
+    return;
+
   if (new_keeping_alive) {
     DVLOG(1) << "KeepAliveRegistry is now keeping the browser alive.";
-    chrome::IncrementKeepAliveCount();
+    g_browser_process->AddRefModule();
   } else {
     DVLOG(1) << "KeepAliveRegistry stopped keeping the browser alive.";
-    chrome::DecrementKeepAliveCount();
+    g_browser_process->ReleaseModule();
+    chrome::CloseAllBrowsersIfNeeded();
   }
 }
 
 void KeepAliveRegistry::OnRestartAllowedChanged(bool new_restart_allowed) {
   DVLOG(1) << "Notifying KeepAliveStateObservers: Restart changed to: "
            << new_restart_allowed;
   FOR_EACH_OBSERVER(KeepAliveStateObserver, observers_,
                     OnKeepAliveRestartStateChanged(new_restart_allowed));
 }
 
 #ifndef NDEBUG
 std::ostream& operator<<(std::ostream& out, const KeepAliveRegistry& registry) {
-  out << "{KeepingAlive=" << registry.IsKeepingAlive()
-      << ", RestartAllowed=" << registry.IsRestartAllowed() << ", KeepAlives=[";
+  out << "{registered_count_=" << registry.registered_count_
+      << ", restart_allowed_count_=" << registry.restart_allowed_count_
+      << ", KeepAlives=[";
   for (auto counts_per_origin_it : registry.registered_keep_alives_) {
     if (counts_per_origin_it != *registry.registered_keep_alives_.begin())
       out << ", ";
     out << counts_per_origin_it.first << " (" << counts_per_origin_it.second
         << ")";
   }
   out << "]}";
   return out;
 }
 #endif  // ndef NDEBUG