Add DBusStatistics and DBusLogSource to log and show dbus stats

chrome/browser/chromeos/system_logs/system_logs_fetcher.cc

 // Copyright (c) 2012 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/chromeos/system_logs/system_logs_fetcher.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/chromeos/system_logs/command_line_log_source.h"
+#include "chrome/browser/chromeos/system_logs/dbus_log_source.h"
 #include "chrome/browser/chromeos/system_logs/debug_daemon_log_source.h"
 #include "chrome/browser/chromeos/system_logs/lsb_release_log_source.h"
 #include "chrome/browser/chromeos/system_logs/memory_details_log_source.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 namespace chromeos {
 
 SystemLogsFetcher::SystemLogsFetcher()
     : response_(new SystemLogsResponse),
       num_pending_requests_(0),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
   // Debug Daemon data source.
   data_sources_.push_back(new DebugDaemonLogSource());
 
   // Chrome data sources.
   data_sources_.push_back(new CommandLineLogSource());
+  data_sources_.push_back(new DBusLogSource());
   data_sources_.push_back(new LsbReleaseLogSource());
   data_sources_.push_back(new MemoryDetailsLogSource());
 
   num_pending_requests_ = data_sources_.size();
 }
 
 SystemLogsFetcher::~SystemLogsFetcher() {}
 
 void SystemLogsFetcher::Fetch(const SysLogsFetcherCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(callback_.is_null());
   DCHECK(!callback.is_null());
 
   callback_ = callback;
   for (size_t i = 0; i < data_sources_.size(); ++i) {
     data_sources_[i]->Fetch(base::Bind(&SystemLogsFetcher::AddResponse,
                                        weak_ptr_factory_.GetWeakPtr()));
   }
 }
 
 void SystemLogsFetcher::AddResponse(SystemLogsResponse* response) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   for (SystemLogsResponse::const_iterator it = response->begin();
        it != response->end();
        ++it) {
-    // It is false if the insert if there is already an element with the same
-    // key.
+    // It is an error to insert an element with a pre-existing key.
     bool ok = response_->insert(*it).second;
     DCHECK(ok) << "Duplicate key found: " << it->first;
   }
 
-
   --num_pending_requests_;
   if (num_pending_requests_ > 0)
     return;
 
   callback_.Run(response_.Pass());
   BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, this);
 }
 
 }  // namespace chromeos
-