Run the later parts of startup as UI thread tasks

content/common/startup_task_runner.cc

+// Copyright (c) 2013 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 "content/public/common/startup_task_runner.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/message_loop/message_loop.h"
+
+namespace content {
+
+StartupTaskRunner::StartupTaskRunner(StartupMode mode, Observer* observer)
+    : startup_mode_(mode), observer_(observer), proxy_(NULL) {}
+
+void StartupTaskRunner::AddTask(base::Closure& callback) {
+  task_list_.push_back(callback);
+}
+
+void StartupTaskRunner::SetProxy(
+    const scoped_refptr<base::SingleThreadTaskRunner>& proxy) {
+  proxy_ = proxy;
+}
+
+void StartupTaskRunner::StartRunningTasks() {
+  CHECK(proxy_);
+  if (startup_mode_ == INCREMENTAL) {
+    const base::Closure next_task =
+        base::Bind(&StartupTaskRunner::WrappedTask, this);
+    proxy_->PostNonNestableTask(FROM_HERE, next_task);
+  } else {
+    for (std::list<base::Closure>::iterator it = task_list_.begin();
+         it != task_list_.end();
+         it++) {
+      it->Run();
+    }
+    if (observer_ != NULL) {
+      observer_->AllStartupTasksRan();
+    }
+  }
+}
+
+void StartupTaskRunner::WrappedTask() {
+  // Run the current task
+  if (task_list_.empty()) {
+    // Tell the observer (if any)
+    if (observer_ != NULL) {
+      observer_->AllStartupTasksRan();
+    }
+  } else {
+    // Run the current task
+    task_list_.front().Run();
+    task_list_.pop_front();
+    // Queue the next task
+    const base::Closure next_task =
+        base::Bind(&StartupTaskRunner::WrappedTask, this);
+    proxy_->PostNonNestableTask(FROM_HERE, next_task);
+  }
+}
+
+}  // namespace content