Chromium线程创建解析：从源码看初始化流程

Chrome_UIThread:
./base/threading/thread.cc:61  Thread::Thread(const std::string& name)
./content/browser/browser_thread_impl.cc:154 (discriminator 3)  : Thread(GetThreadName(identifier)), identifier_(identifier) {
./content/browser/browser_main_loop.cc:1204 (discriminator 2)  new BrowserThreadImpl(BrowserThread::UI, base::MessageLoop::current()));
./content/browser/browser_main_loop.cc:575  InitializeMainThread();
./content/browser/browser_main_runner.cc:129 (discriminator 1)  main_loop_->MainMessageLoopStart();
./android_webview/lib/main/aw_main_delegate.cc:203 (discriminator 1)  int exit_code = browser_runner_->Initialize(main_function_params);
./content/app/content_main_runner.cc:403  int exit_code = delegate->RunProcess(process_type,
./content/app/content_main_runner.cc:786  return RunNamedProcessTypeMain(process_type, main_params, delegate_);
./content/app/android/content_main.cc:47 (discriminator 2)  return g_content_runner.Get()->Run();

Chrome_DBThread:
./base/threading/thread.cc:61  Thread::Thread(const std::string& name)
./content/browser/browser_thread_impl.cc:141 (discriminator 3)  : Thread(GetThreadName(identifier)), identifier_(identifier) {
./content/browser/browser_process_sub_thread.cc:24  : BrowserThreadImpl(identifier) {
./content/browser/browser_main_loop.cc:948 (discriminator 1)  (*thread_to_start).reset(new BrowserProcessSubThread(id));
./base/callback.h:64 (discriminator 1)
./content/browser/browser_main_loop.cc:854 (discriminator 1)  startup_task_runner_->RunAllTasksNow();
./content/browser/browser_main_runner.cc:141 (discriminator 1)  main_loop_->CreateStartupTasks();
./android_webview/lib/main/aw_main_delegate.cc:203 (discriminator 1)  int exit_code = browser_runner_->Initialize(main_function_params); 
./content/app/content_main_runner.cc:403  int exit_code = delegate->RunProcess(process_type,
./content/app/content_main_runner.cc:786  return RunNamedProcessTypeMain(process_type, main_params, delegate_);
./content/app/android/content_main.cc:47 (discriminator 2)  return g_content_runner.Get()->Run();

Chrome_FileThread:
./base/threading/thread.cc:61  Thread::Thread(const std::string& name)
./content/browser/browser_thread_impl.cc:141 (discriminator 3)  : Thread(GetThreadName(identifier)), identifier_(identifier) {
./content/browser/browser_process_sub_thread.cc:24  : BrowserThreadImpl(identifier) {
./content/browser/browser_main_loop.cc:948 (discriminator 1)  (*thread_to_start).reset(new BrowserProcessSubThread(id));
./base/callback.h:64 (discriminator 1)

./content/browser/browser_main_loop.cc:854 (discriminator 1)  startup_task_runner_->RunAllTasksNow();
./content/browser/browser_main_runner.cc:141 (discriminator 1)  main_loop_->CreateStartupTasks();
./android_webview/lib/main/aw_main_delegate.cc:203 (discriminator 1)  int exit_code = browser_runner_->Initialize(main_function_params); 
./content/app/content_main_runner.cc:403  int exit_code = delegate->RunProcess(process_type,
./content/app/content_main_runner.cc:786  return RunNamedProcessTypeMain(process_type, main_params, delegate_);
./content/app/android/content_main.cc:47 (discriminator 2)  return g_content_runner.Get()->Run();

Chrome_FileUserBlockingThread:
./base/threading/thread.cc:61  Thread::Thread(const std::string& name)
./content/browser/browser_thread_impl.cc:141 (discriminator 3)  : Thread(GetThreadName(identifier)), identifier_(identifier) {
./content/browser/browser_process_sub_thread.cc:24  : BrowserThreadImpl(identifier) {
./content/browser/browser_main_loop.cc:948 (discriminator 1)  (*thread_to_start).reset(new BrowserProcessSubThread(id));
./base/callback.h:64 (discriminator 1)
./content/browser/browser_main_loop.cc:854 (discriminator 1)  startup_task_runner_->RunAllTasksNow();
./content/browser/browser_main_runner.cc:141 (discriminator 1)  main_loop_->CreateStartupTasks();
./android_webview/lib/main/aw_main_delegate.cc:203 (discriminator 1)  int exit_code = browser_runner_->Initialize(main_function_params); 
./content/app/content_main_runner.cc:403  int exit_code = delegate->RunProcess(process_type,
./content/app/content_main_runner.cc:786  return RunNamedProcessTypeMain(process_type, main_params, delegate_);
./content/app/android/content_main.cc:47 (discriminator 2)  return g_content_runner.Get()->Run();

Chrome_ProcessLauncherThread
./base/threading/thread.cc:61  Thread::Thread(const std::string& name)
./content/browser/browser_thread_impl.cc:141 (discriminator 3)  : Thread(GetThreadName(identifier)), identifier_(identifier) {
./content/browser/browser_process_sub_thread.cc:24  : BrowserThreadImpl(identifier) {
./content/browser/browser_main_loop.cc:948 (discriminator 1)  (*thread_to_start).reset(new BrowserProcessSubThread(id));
./base/callback.h:64 (discriminator 1)
./content/browser/browser_main_loop.cc:854 (discriminator 1)  startup_task_runner_->RunAllTasksNow();
./content/browser/browser_main_runner.cc:141 (discriminator 1)  main_loop_->CreateStartupTasks();
./android_webview/lib/main/aw_main_delegate.cc:203 (discriminator 1)  int exit_code = browser_runner_->Initialize(main_function_params); 
./content/app/content_main_runner.cc:403  int exit_code = delegate->RunProcess(process_type,