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

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"
@@ skipping 70 matching lines @@
 void KeepAliveRegistry::Register(KeepAliveOrigin origin,
                                  KeepAliveRestartOption restart) {
   DCHECK(!g_browser_process->IsShuttingDown());
 
   bool old_keeping_alive = IsKeepingAlive();
   bool old_restart_allowed = IsRestartAllowed();
 
   ++registered_keep_alives_[origin];
   ++registered_count_;
 
+  LOG(ERROR) << "Registered: " << origin << ", Count:" << registered_count_;
   if (restart == KeepAliveRestartOption::ENABLED) {
     ++restart_allowed_keep_alives_[origin];
     ++restart_allowed_count_;
   }
 
   bool new_keeping_alive = IsKeepingAlive();
   bool new_restart_allowed = IsRestartAllowed();
 
   if (new_keeping_alive != old_keeping_alive)
     OnKeepAliveStateChanged(new_keeping_alive);
 
   if (new_restart_allowed != old_restart_allowed)
     OnRestartAllowedChanged(new_restart_allowed);
 
   DVLOG(1) << "New state of the KeepAliveRegistry: " << *this;
 }
 
 void KeepAliveRegistry::Unregister(KeepAliveOrigin origin,
                                    KeepAliveRestartOption restart) {
   bool old_keeping_alive = IsKeepingAlive();
   bool old_restart_allowed = IsRestartAllowed();
 
   --registered_count_;
   DCHECK_GE(registered_count_, 0);
   DecrementCount(origin, &registered_keep_alives_);
+  LOG(ERROR) << "Unregistered: " << origin << ", Count:" << registered_count_;
 
   if (restart == KeepAliveRestartOption::ENABLED) {
     --restart_allowed_count_;
     DecrementCount(origin, &restart_allowed_keep_alives_);
   }
 
   bool new_keeping_alive = IsKeepingAlive();
   bool new_restart_allowed = IsRestartAllowed();
 
   // Update the KeepAlive state first, so that listeners can check if we are
@@ skipping 35 matching lines @@
       << ", 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;
 }