Move system.* family of APIs to extensions/

chrome/browser/extensions/api/system_info/system_info_provider.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 "chrome/browser/extensions/api/system_info/system_info_provider.h"
-
-#include "base/bind.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace extensions {
-
-SystemInfoProvider::SystemInfoProvider()
-    : is_waiting_for_completion_(false) {
-  base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool();
-  worker_pool_ = pool->GetSequencedTaskRunnerWithShutdownBehavior(
-      pool->GetSequenceToken(),
-      base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN);
-}
-
-SystemInfoProvider::~SystemInfoProvider() {}
-
-void SystemInfoProvider::PrepareQueryOnUIThread() {}
-
-void SystemInfoProvider::InitializeProvider(const base::Closure&
-    do_query_info_callback) {
-  do_query_info_callback.Run();
-}
-
-void SystemInfoProvider::StartQueryInfo(
-    const QueryInfoCompletionCallback& callback) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  DCHECK(!callback.is_null());
-
-  callbacks_.push(callback);
-
-  if (is_waiting_for_completion_)
-    return;
-
-  is_waiting_for_completion_ = true;
-
-  InitializeProvider(base::Bind(
-      &SystemInfoProvider::StartQueryInfoPostInitialization, this));
-}
-
-void SystemInfoProvider::OnQueryCompleted(bool success) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-
-  while (!callbacks_.empty()) {
-    QueryInfoCompletionCallback callback = callbacks_.front();
-    callback.Run(success);
-    callbacks_.pop();
-  }
-
-  is_waiting_for_completion_ = false;
-}
-
-void SystemInfoProvider::StartQueryInfoPostInitialization() {
-  PrepareQueryOnUIThread();
-  // Post the custom query info task to blocking pool for information querying
-  // and reply with OnQueryCompleted.
-  base::PostTaskAndReplyWithResult(
-      worker_pool_,
-      FROM_HERE,
-      base::Bind(&SystemInfoProvider::QueryInfo, this),
-      base::Bind(&SystemInfoProvider::OnQueryCompleted, this));
-}
-
-}  // namespace extensions