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// 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 <memory>
#include <vector>
#include "base/macros.h"
#include "base/metrics/field_trial.h"
#include "base/profiler/stack_sampling_profiler.h"
#include "build/build_config.h"
#include "chrome/browser/chrome_browser_field_trials.h"
#include "chrome/browser/chrome_process_singleton.h"
#include "chrome/browser/first_run/first_run.h"
#include "chrome/browser/process_singleton.h"
#include "chrome/browser/ui/startup/startup_browser_creator.h"
#include "chrome/common/stack_sampling_configuration.h"
#include "components/metrics/call_stack_profile_params.h"
#include "content/public/browser/browser_main_parts.h"
#include "content/public/common/main_function_params.h"
class BrowserProcessImpl;
class ChromeBrowserMainExtraParts;
class FieldTrialSynchronizer;
class PrefService;
class Profile;
class StartupBrowserCreator;
class StartupTimeBomb;
class ShutdownWatcherHelper;
class ThreeDAPIObserver;
class WebUsbDetector;
namespace chrome_browser {
// For use by ShowMissingLocaleMessageBox.
#if defined(OS_WIN)
extern const char kMissingLocaleDataTitle[];
#if defined(OS_WIN)
extern const char kMissingLocaleDataMessage[];
class ChromeBrowserMainParts : public content::BrowserMainParts {
~ChromeBrowserMainParts() override;
// Add additional ChromeBrowserMainExtraParts.
virtual void AddParts(ChromeBrowserMainExtraParts* parts);
explicit ChromeBrowserMainParts(
const content::MainFunctionParams& parameters);
// content::BrowserMainParts overrides.
// These are called in-order by content::BrowserMainLoop.
// Each stage calls the same stages in any ChromeBrowserMainExtraParts added
// with AddParts() from ChromeContentBrowserClient::CreateBrowserMainParts.
int PreEarlyInitialization() override;
void PostEarlyInitialization() override;
void ToolkitInitialized() override;
void PreMainMessageLoopStart() override;
void PostMainMessageLoopStart() override;
int PreCreateThreads() override;
void ServiceManagerConnectionStarted(
content::ServiceManagerConnection* connection) override;
void PreMainMessageLoopRun() override;
bool MainMessageLoopRun(int* result_code) override;
void PostMainMessageLoopRun() override;
void PreShutdown() override;
void PostDestroyThreads() override;
// Additional stages for ChromeBrowserMainExtraParts. These stages are called
// in order from PreMainMessageLoopRun(). See implementation for details.
virtual void PreProfileInit();
virtual void PostProfileInit();
virtual void PreBrowserStart();
virtual void PostBrowserStart();
// Displays a warning message that we can't find any locale data files.
virtual void ShowMissingLocaleMessageBox() = 0;
const content::MainFunctionParams& parameters() const {
return parameters_;
const base::CommandLine& parsed_command_line() const {
return parsed_command_line_;
const base::FilePath& user_data_dir() const {
return user_data_dir_;
Profile* profile() { return profile_; }
// Sets up the field trials and related initialization. Call only after
// about:flags have been converted to switches.
void SetupFieldTrials();
// Constructs the metrics service and initializes metrics recording.
void SetupMetrics();
// Starts recording of metrics. This can only be called after we have a file
// thread.
void StartMetricsRecording();
// Record time from process startup to present time in an UMA histogram.
void RecordBrowserStartupTime();
// Reads origin trial policy data from local state and configures command line
// for child processes.
void SetupOriginTrialsCommandLine(PrefService* local_state);
// Methods for Main Message Loop -------------------------------------------
int PreCreateThreadsImpl();
int PreMainMessageLoopRunImpl();
// Members initialized on construction ---------------------------------------
const content::MainFunctionParams parameters_;
const base::CommandLine& parsed_command_line_;
int result_code_;
// Create StartupTimeBomb object for watching jank during startup.
std::unique_ptr<StartupTimeBomb> startup_watcher_;
// Create ShutdownWatcherHelper object for watching jank during shutdown.
// Please keep |shutdown_watcher| as the first object constructed, and hence
// it is destroyed last.
std::unique_ptr<ShutdownWatcherHelper> shutdown_watcher_;
// Statistical testing infrastructure for the entire browser. nullptr until
// |SetupFieldTrials()| is called.
std::unique_ptr<base::FieldTrialList> field_trial_list_;
ChromeBrowserFieldTrials browser_field_trials_;
#if !defined(OS_ANDROID)
std::unique_ptr<WebUsbDetector> web_usb_detector_;
// Vector of additional ChromeBrowserMainExtraParts.
// Parts are deleted in the inverse order they are added.
std::vector<ChromeBrowserMainExtraParts*> chrome_extra_parts_;
// A profiler that periodically samples stack traces. Used to sample startup
// behavior.
base::StackSamplingProfiler sampling_profiler_;
// Members initialized after / released before main_message_loop_ ------------
std::unique_ptr<BrowserProcessImpl> browser_process_;
#if !defined(OS_ANDROID)
// Browser creation happens on the Java side in Android.
std::unique_ptr<StartupBrowserCreator> browser_creator_;
// Android doesn't support multiple browser processes, so it doesn't implement
// ProcessSingleton.
std::unique_ptr<ChromeProcessSingleton> process_singleton_;
// Android's first run is done in Java instead of native.
std::unique_ptr<first_run::MasterPrefs> master_prefs_;
ProcessSingleton::NotifyResult notify_result_ =
// Members needed across shutdown methods.
bool restart_last_session_ = false;
Profile* profile_;
bool run_message_loop_;
std::unique_ptr<ThreeDAPIObserver> three_d_observer_;
// Initialized in |SetupFieldTrials()|.
scoped_refptr<FieldTrialSynchronizer> field_trial_synchronizer_;
base::FilePath user_data_dir_;