Revert of services/ui: Revert CLs that broke Windows.

services/ui/gles2/command_buffer_task_runner.cc

-// Copyright 2014 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 "services/ui/gles2/command_buffer_task_runner.h"
-
-#include "base/bind.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "services/ui/gles2/command_buffer_driver.h"
-
-namespace ui {
-
-CommandBufferTaskRunner::CommandBufferTaskRunner()
-    : task_runner_(base::ThreadTaskRunnerHandle::Get()),
-      need_post_task_(true) {
-}
-
-bool CommandBufferTaskRunner::PostTask(
-    const CommandBufferDriver* driver,
-    const TaskCallback& task) {
-  base::AutoLock locker(lock_);
-  driver_map_[driver].push_back(task);
-  ScheduleTaskIfNecessaryLocked();
-  return true;
-}
-
-CommandBufferTaskRunner::~CommandBufferTaskRunner() {}
-
-bool CommandBufferTaskRunner::RunOneTaskInternalLocked() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  lock_.AssertAcquired();
-
-  for (auto it = driver_map_.begin(); it != driver_map_.end(); ++it) {
-    if (!it->first->IsScheduled())
-      continue;
-    TaskQueue& task_queue = it->second;
-    DCHECK(!task_queue.empty());
-    const TaskCallback& callback = task_queue.front();
-    bool complete = false;
-    {
-      base::AutoUnlock unlocker(lock_);
-      complete = callback.Run();
-    }
-    if (complete) {
-      // Only remove the task if it is complete.
-      task_queue.pop_front();
-      if (task_queue.empty())
-        driver_map_.erase(it);
-    }
-    return true;
-  }
-  return false;
-}
-
-void CommandBufferTaskRunner::ScheduleTaskIfNecessaryLocked() {
-  lock_.AssertAcquired();
-  if (!need_post_task_)
-    return;
-  task_runner()->PostTask(
-      FROM_HERE,
-      base::Bind(&CommandBufferTaskRunner::RunCommandBufferTask, this));
-  need_post_task_ = false;
-}
-
-void CommandBufferTaskRunner::RunCommandBufferTask() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  base::AutoLock locker(lock_);
-
-  // Try executing all tasks in |driver_map_| until |RunOneTaskInternalLock()|
-  // returns false (Returning false means |driver_map_| is empty or all tasks
-  // in it aren't executable currently).
-  while (RunOneTaskInternalLocked())
-    ;
-  need_post_task_ = true;
-}
-
-}  // namespace ui