Revert of Reland: Lazily initialize MessageLoop for faster thread startup

base/message_loop/message_loop.cc

Index: base/message_loop/message_loop.cc
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index 4222c774dd58b20354d6b0e4c948efcbbf5abf1b..eb0f968849485ea73ef8a1aab9094bb9527af403 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -100,10 +100,6 @@
 }
 #endif  // !defined(OS_NACL_SFI)
 
-scoped_ptr<MessagePump> ReturnPump(scoped_ptr<MessagePump> pump) {
-  return pump;
-}
-
 }  // namespace
 
 //------------------------------------------------------------------------------
@@ -120,19 +116,41 @@
 //------------------------------------------------------------------------------
 
 MessageLoop::MessageLoop(Type type)
-    : MessageLoop(type, MessagePumpFactoryCallback()) {
-  BindToCurrentThread();
+    : type_(type),
+#if defined(OS_WIN)
+      pending_high_res_tasks_(0),
+      in_high_res_mode_(false),
+#endif
+      nestable_tasks_allowed_(true),
+#if defined(OS_WIN)
+      os_modal_loop_(false),
+#endif  // OS_WIN
+      message_histogram_(NULL),
+      run_loop_(NULL) {
+  Init();
+
+  pump_ = CreateMessagePumpForType(type).Pass();
 }
 
 MessageLoop::MessageLoop(scoped_ptr<MessagePump> pump)
-    : MessageLoop(TYPE_CUSTOM, Bind(&ReturnPump, Passed(&pump))) {
-  BindToCurrentThread();
+    : pump_(pump.Pass()),
+      type_(TYPE_CUSTOM),
+#if defined(OS_WIN)
+      pending_high_res_tasks_(0),
+      in_high_res_mode_(false),
+#endif
+      nestable_tasks_allowed_(true),
+#if defined(OS_WIN)
+      os_modal_loop_(false),
+#endif  // OS_WIN
+      message_histogram_(NULL),
+      run_loop_(NULL) {
+  DCHECK(pump_.get());
+  Init();
 }
 
 MessageLoop::~MessageLoop() {
-  // current() could be NULL if this message loop is destructed before it is
-  // bound to a thread.
-  DCHECK(current() == this || !current());
+  DCHECK_EQ(this, current());
 
   // iOS just attaches to the loop, it doesn't Run it.
   // TODO(stuartmorgan): Consider wiring up a Detach().
@@ -281,13 +299,11 @@
 }
 
 void MessageLoop::Run() {
-  DCHECK(pump_);
   RunLoop run_loop;
   run_loop.Run();
 }
 
 void MessageLoop::RunUntilIdle() {
-  DCHECK(pump_);
   RunLoop run_loop;
   run_loop.RunUntilIdle();
 }
@@ -367,43 +383,13 @@
 
 //------------------------------------------------------------------------------
 
-scoped_ptr<MessageLoop> MessageLoop::CreateUnbound(
-    Type type, MessagePumpFactoryCallback pump_factory) {
-  return make_scoped_ptr(new MessageLoop(type, pump_factory));
-}
-
-MessageLoop::MessageLoop(Type type, MessagePumpFactoryCallback pump_factory)
-    : type_(type),
-#if defined(OS_WIN)
-      pending_high_res_tasks_(0),
-      in_high_res_mode_(false),
-#endif
-      nestable_tasks_allowed_(true),
-#if defined(OS_WIN)
-      os_modal_loop_(false),
-#endif  // OS_WIN
-      pump_factory_(pump_factory),
-      message_histogram_(NULL),
-      run_loop_(NULL),
-      incoming_task_queue_(new internal::IncomingTaskQueue(this)),
-      message_loop_proxy_(
-          new internal::MessageLoopProxyImpl(incoming_task_queue_)) {
-  // If type is TYPE_CUSTOM non-null pump_factory must be given.
-  DCHECK_EQ(type_ == TYPE_CUSTOM, !pump_factory_.is_null());
-}
-
-void MessageLoop::BindToCurrentThread() {
-  DCHECK(!pump_);
-  if (!pump_factory_.is_null())
-    pump_ = pump_factory_.Run();
-  else
-    pump_ = CreateMessagePumpForType(type_);
-
+void MessageLoop::Init() {
   DCHECK(!current()) << "should only have one message loop per thread";
   lazy_tls_ptr.Pointer()->Set(this);
 
-  incoming_task_queue_->StartScheduling();
-  message_loop_proxy_->BindToCurrentThread();
+  incoming_task_queue_ = new internal::IncomingTaskQueue(this);
+  message_loop_proxy_ =
+      new internal::MessageLoopProxyImpl(incoming_task_queue_);
   thread_task_runner_handle_.reset(
       new ThreadTaskRunnerHandle(message_loop_proxy_));
 }