Mojoify time zone update IPC from browser to renderer

content/browser/time_zone_monitor.cc

 // Copyright 2014 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 "content/browser/time_zone_monitor.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "content/public/browser/browser_thread.h"
-#include "content/public/browser/render_process_host.h"
 #include "third_party/icu/source/common/unicode/unistr.h"
 #include "third_party/icu/source/i18n/unicode/timezone.h"
 
 namespace content {
 
 TimeZoneMonitor::TimeZoneMonitor() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 }
 
 TimeZoneMonitor::~TimeZoneMonitor() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  // Explicitly tear down the connections so that the callbacks in
+  // |on_time_zone_change_tasks_| can safely be destroyed (otherwise they
+  // can DCHECK due to being destroyed unfilled while their connection is
+  // still active).
+  bindings_.CloseAllBindings();
 }
 
-void TimeZoneMonitor::NotifyRenderers() {
+void TimeZoneMonitor::Bind(device::mojom::TimeZoneMonitorRequest request) {
+  bindings_.AddBinding(this, std::move(request));
+}
+
+void TimeZoneMonitor::NotifyClients() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #if defined(OS_CHROMEOS)
   // On CrOS, ICU's default tz is already set to a new zone. No
   // need to redetect it with detectHostTimeZone().
   std::unique_ptr<icu::TimeZone> new_zone(icu::TimeZone::createDefault());
 #else
   icu::TimeZone* new_zone = icu::TimeZone::detectHostTimeZone();
 #if defined(OS_LINUX)
   // We get here multiple times on Linux per a single tz change, but
   // want to update the ICU default zone and notify renderer only once.
   std::unique_ptr<icu::TimeZone> current_zone(icu::TimeZone::createDefault());
   if (*current_zone == *new_zone) {
     VLOG(1) << "timezone already updated";
     delete new_zone;
     return;
   }
 #endif
   icu::TimeZone::adoptDefault(new_zone);
 #endif
   icu::UnicodeString zone_id;
   std::string zone_id_str;
   new_zone->getID(zone_id).toUTF8String(zone_id_str);
   VLOG(1) << "timezone reset to " << zone_id_str;
-  for (RenderProcessHost::iterator iterator =
-           RenderProcessHost::AllHostsIterator();
-       !iterator.IsAtEnd();
-       iterator.Advance()) {
-    iterator.GetCurrentValue()->NotifyTimezoneChange(zone_id_str);
-  }
+
+  std::vector<device::mojom::TimeZoneMonitor::QueryNextTimeZoneChangeCallback>
+      tasks;
+  on_time_zone_change_tasks_.swap(tasks);
+  for (auto& task : tasks)
+    task.Run(zone_id_str);
+}
+
+void TimeZoneMonitor::QueryNextTimeZoneChange(
+    const device::mojom::TimeZoneMonitor::QueryNextTimeZoneChangeCallback&
+        callback) {
+  on_time_zone_change_tasks_.push_back(callback);
 }
 
 }  // namespace content