Push API: Add temporary debug log to track down crash

chrome/browser/services/gcm/gcm_profile_service.cc

 // Copyright (c) 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 "chrome/browser/services/gcm/gcm_profile_service.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
@@ skipping 124 matching lines @@
 void GCMProfileService::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kGCMChannelEnabled,
       true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   PushMessagingServiceImpl::RegisterProfilePrefs(registry);
 }
 
 #if defined(OS_ANDROID)
+static GCMProfileService* debug_instance = nullptr;  // TODO(johnme): Remove.
+
 GCMProfileService::GCMProfileService(Profile* profile)
     : profile_(profile),
       push_messaging_service_(this, profile) {
-  DCHECK(!profile->IsOffTheRecord());
+  CHECK(!profile->IsOffTheRecord());
+
+  // TODO(johnme): Remove this debug code once the following crash has been
+  // understood: https://goto.google.com/gcmdriver-already-instantiated

[Bernhard Bauer, 2015/01/08 16:38:25]

Just reference the bug here.

[johnme, 2015/01/08 16:49:01]

Done.

+  if (debug_instance != nullptr) {
+    LOG(FATAL) << "An instance of GCMProfileService already exists!"
+               << " Old profile: " << debug_instance->profile_ << " "
+               << debug_instance->profile_->GetDebugName() << " "
+               << debug_instance->profile_->GetProfileType() << " "
+               << debug_instance->profile_->IsSupervised() << " "
+               << debug_instance->profile_->IsNewProfile() << " "
+               << debug_instance->profile_->GetStartTime().ToInternalValue()
+               << ", new profile: " << profile << " "
+               << profile_->GetDebugName() << " "
+               << profile_->GetProfileType() << " "
+               << profile_->IsSupervised() << " "
+               << profile_->IsNewProfile() << " "
+               << profile_->GetStartTime().ToInternalValue();
+  }
+  debug_instance = this;
 
   driver_.reset(new GCMDriverAndroid);
 }
 #else
 GCMProfileService::GCMProfileService(
     Profile* profile,
     scoped_ptr<GCMClientFactory> gcm_client_factory)
     : profile_(profile),
       push_messaging_service_(this, profile) {
   DCHECK(!profile->IsOffTheRecord());
@@ skipping 37 matching lines @@
 
 void GCMProfileService::SetDriverForTesting(GCMDriver* driver) {
   driver_.reset(driver);
 #if !defined(OS_ANDROID)
   if (identity_observer_)
     identity_observer_.reset(new IdentityObserver(profile_, driver));
 #endif  // !defined(OS_ANDROID)
 }
 
 }  // namespace gcm