Add DBusStatistics and DBusLogSource to log and show dbus stats

chrome/browser/chromeos/system_logs/system_logs_fetcher.cc

Index: chrome/browser/chromeos/system_logs/system_logs_fetcher.cc
diff --git a/chrome/browser/chromeos/system_logs/system_logs_fetcher.cc b/chrome/browser/chromeos/system_logs/system_logs_fetcher.cc
index ea7fa9e5e92c893b3ab74e72733db5d10746a4bf..446278e6052836960bcf9b1a59766cbf73fea8b1 100644
--- a/chrome/browser/chromeos/system_logs/system_logs_fetcher.cc
+++ b/chrome/browser/chromeos/system_logs/system_logs_fetcher.cc
@@ -7,6 +7,7 @@
 #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"
@@ -25,6 +26,7 @@ SystemLogsFetcher::SystemLogsFetcher()
 
   // 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());
 
@@ -51,13 +53,11 @@ void SystemLogsFetcher::AddResponse(SystemLogsResponse* response) {
   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;
@@ -67,4 +67,3 @@ void SystemLogsFetcher::AddResponse(SystemLogsResponse* response) {
 }
 
 }  // namespace chromeos
-