Revert "Delete CC."

cc/base/blocking_task_runner.cc

+// Copyright 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 "cc/base/blocking_task_runner.h"
+
+#include <utility>
+
+#include "base/callback.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop_proxy.h"
+
+namespace cc {
+
+// static
+scoped_ptr<BlockingTaskRunner> BlockingTaskRunner::Create(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
+  return make_scoped_ptr(new BlockingTaskRunner(task_runner));
+}
+
+BlockingTaskRunner::BlockingTaskRunner(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    : thread_id_(base::PlatformThread::CurrentId()),
+      task_runner_(task_runner),
+      capture_(0) {
+}
+
+BlockingTaskRunner::~BlockingTaskRunner() {
+}
+
+bool BlockingTaskRunner::BelongsToCurrentThread() {
+  return base::PlatformThread::CurrentId() == thread_id_;
+}
+
+bool BlockingTaskRunner::PostTask(const tracked_objects::Location& from_here,
+                                  const base::Closure& task) {
+  base::AutoLock lock(lock_);
+  DCHECK(task_runner_.get() || capture_);
+  if (!capture_)
+    return task_runner_->PostTask(from_here, task);
+  captured_tasks_.push_back(task);
+  return true;
+}
+
+void BlockingTaskRunner::SetCapture(bool capture) {
+  DCHECK(BelongsToCurrentThread());
+
+  std::vector<base::Closure> tasks;
+
+  {
+    base::AutoLock lock(lock_);
+    capture_ += capture ? 1 : -1;
+    DCHECK_GE(capture_, 0);
+
+    if (capture_)
+      return;
+
+    // We're done capturing, so grab all the captured tasks and run them.
+    tasks.swap(captured_tasks_);
+  }
+  for (size_t i = 0; i < tasks.size(); ++i)
+    tasks[i].Run();
+}
+
+BlockingTaskRunner::CapturePostTasks::CapturePostTasks(
+    BlockingTaskRunner* blocking_runner)
+    : blocking_runner_(blocking_runner) {
+  blocking_runner_->SetCapture(true);
+}
+
+BlockingTaskRunner::CapturePostTasks::~CapturePostTasks() {
+  blocking_runner_->SetCapture(false);
+}
+
+}  // namespace cc