CrOS: Add print statements to help debug BrowserProcessImpl::Unpin crash.

chrome/browser/push_messaging/push_messaging_service_impl.h

 // 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.
 
 #ifndef CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_
 #define CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_
 
 #include <stdint.h>
 #include <memory>
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/background/background_trigger.h"
 #include "chrome/browser/push_messaging/push_messaging_notification_manager.h"
 #include "chrome/common/features.h"
 #include "components/content_settings/core/browser/content_settings_observer.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "components/gcm_driver/common/gcm_messages.h"
 #include "components/gcm_driver/gcm_app_handler.h"
 #include "components/gcm_driver/gcm_client.h"
 #include "components/gcm_driver/instance_id/instance_id.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/push_messaging_service.h"
 #include "content/public/common/push_event_payload.h"
 #include "content/public/common/push_messaging_status.h"
 #include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
 #include "third_party/WebKit/public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 
 class Profile;
 class PushMessagingAppIdentifier;
 class PushMessagingServiceObserver;
 class PushMessagingServiceTest;
 class ScopedKeepAlive;
 struct PushSubscriptionOptions;
 
 namespace gcm {
 class GCMDriver;
 }
 namespace instance_id {
 class InstanceIDDriver;
 }
 
 class PushMessagingServiceImpl : public content::PushMessagingService,
+                                 public content::NotificationObserver,
                                  public gcm::GCMAppHandler,
                                  public content_settings::Observer,
                                  public KeyedService,
                                  public BackgroundTrigger {
  public:
   // If any Service Workers are using push, starts GCM and adds an app handler.
   static void InitializeForProfile(Profile* profile);
 
   explicit PushMessagingServiceImpl(Profile* profile);
   ~PushMessagingServiceImpl() override;
 
   // gcm::GCMAppHandler implementation.
   void ShutdownHandler() override;
   void OnStoreReset() override;
   void OnMessage(const std::string& app_id,
                  const gcm::IncomingMessage& message) override;
   void OnMessagesDeleted(const std::string& app_id) override;
   void OnSendError(
       const std::string& app_id,
       const gcm::GCMClient::SendErrorDetails& send_error_details) override;
   void OnSendAcknowledged(const std::string& app_id,
                           const std::string& message_id) override;
   bool CanHandle(const std::string& app_id) const override;
 
+  // content::NotificationObserver:
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
   // content::PushMessagingService implementation:
   GURL GetEndpoint(bool standard_protocol) const override;
   void SubscribeFromDocument(const GURL& requesting_origin,
                              int64_t service_worker_registration_id,
                              int renderer_id,
                              int render_frame_id,
                              const content::PushSubscriptionOptions& options,
                              const RegisterCallback& callback) override;
   void SubscribeFromWorker(const GURL& requesting_origin,
                            int64_t service_worker_registration_id,
@@ skipping 175 matching lines @@
 
   // A multiset containing one entry for each in-flight push message delivery,
   // keyed by the receiver's app id.
   std::multiset<std::string> in_flight_message_deliveries_;
 
   MessageDispatchedCallback message_dispatched_callback_for_testing_;
 
   std::unique_ptr<PushMessagingServiceObserver>
       push_messaging_service_observer_;
 
+  content::NotificationRegistrar registrar_;
+
 #if BUILDFLAG(ENABLE_BACKGROUND)
   // KeepAlive registered while we have in-flight push messages, to make sure
   // we can finish processing them without being interrupted.
   std::unique_ptr<ScopedKeepAlive> in_flight_keep_alive_;
 #endif
 
   base::WeakPtrFactory<PushMessagingServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingServiceImpl);
 };
 
 #endif  // CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_SERVICE_IMPL_H_