ServiceWorker: Add CHECK to EmbeddedWorkerRegistry for debug

content/browser/service_worker/embedded_worker_registry.cc

 // Copyright 2013 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/service_worker/embedded_worker_registry.h"
 
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
@@ skipping 211 matching lines @@
 bool EmbeddedWorkerRegistry::CanHandle(int embedded_worker_id) const {
   if (embedded_worker_id < initial_embedded_worker_id_ ||
       next_embedded_worker_id_ <= embedded_worker_id) {
     return false;
   }
   return true;
 }
 
 MessagePortMessageFilter*
 EmbeddedWorkerRegistry::MessagePortMessageFilterForProcess(int process_id) {
+  // TODO(nhiroki): Change this to DCHECK after https://crbug.com/648477 is
+  // fixed.
+  CHECK(
+      base::ContainsKey(process_message_port_message_filter_map_, process_id));
   return process_message_port_message_filter_map_[process_id];
 }
 
 EmbeddedWorkerRegistry::EmbeddedWorkerRegistry(
     const base::WeakPtr<ServiceWorkerContextCore>& context,
     int initial_embedded_worker_id)
     : context_(context),
       next_embedded_worker_id_(initial_embedded_worker_id),
       initial_embedded_worker_id_(initial_embedded_worker_id) {
 }
@@ skipping 57 matching lines @@
   EmbeddedWorkerInstance* worker = GetWorker(embedded_worker_id);
   if (!worker || worker->process_id() != process_id) {
     UMA_HISTOGRAM_BOOLEAN("ServiceWorker.WorkerForMessageFound", false);
     return nullptr;
   }
   UMA_HISTOGRAM_BOOLEAN("ServiceWorker.WorkerForMessageFound", true);
   return worker;
 }
 
 }  // namespace content