Add histogram to track prerender sessions

chrome/browser/browser_main.cc

 // Copyright (c) 2011 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/browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
 #include "chrome/browser/net/chrome_dns_cert_provenance_checker.h"
 #include "chrome/browser/net/chrome_dns_cert_provenance_checker_factory.h"
 #include "chrome/browser/net/metadata_url_request.h"
 #include "chrome/browser/net/predictor_api.h"
 #include "chrome/browser/net/sdch_dictionary_fetcher.h"
 #include "chrome/browser/net/websocket_experiment/websocket_experiment_runner.h"
 #include "chrome/browser/plugin_service.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/pref_value_store.h"
+#include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_proxy_service.h"
 #include "chrome/browser/process_singleton.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/search_engines/search_engine_type.h"
 #include "chrome/browser/search_engines/template_url.h"
 #include "chrome/browser/search_engines/template_url_model.h"
 #include "chrome/browser/service/service_process_control.h"
 #include "chrome/browser/service/service_process_control_manager.h"
@@ skipping 1505 matching lines @@
     FilePath path =
         parsed_command_line.GetSwitchValuePath(switches::kDebugPrint);
     printing::PrintedDocument::set_debug_dump_path(path);
   }
 #endif
 
   HandleTestParameters(parsed_command_line);
   RecordBreakpadStatusUMA(metrics);
   about_flags::RecordUMAStatistics(user_prefs);
 
+  UMA_HISTOGRAM_ENUMERATION(

[cbentzel, 2011/01/26 16:55:46]

I'd really like this to be placed in PrefetchFieldTrial now so flag reading
happens in one centralized place, rather than both in PrefetchFieldTrial and
GetSessionType

[gavinp, 2011/01/27 04:29:29]

Done.

+      "Prerender.Sessions", PrerenderManager::GetSessionType(),
+      PrerenderManager::PRERENDERING_SESSION_TYPE_MAX);
+
   // Stat the directory with the inspector's files so that we can know if we
   // should display the entry in the context menu or not.
   browser_process->CheckForInspectorFiles();
 
 #if defined(OS_CHROMEOS)
   metrics->StartExternalMetrics();
 #endif
 
   // Initialize extension event routers. Note that on Chrome OS, this will
   // not succeed if the user has not logged in yet, in which case the
@@ skipping 155 matching lines @@
 #if defined(OS_CHROMEOS)
   // To be precise, logout (browser shutdown) is not yet done, but the
   // remaining work is negligible, hence we say LogoutDone here.
   chromeos::BootTimesLoader::Get()->AddLogoutTimeMarker("LogoutDone",
                                                         false);
   chromeos::BootTimesLoader::Get()->WriteLogoutTimes();
 #endif
   TRACE_EVENT_END("BrowserMain", 0, 0);
   return result_code;
 }