Move basic operation components for Drive API to chrome/browser/google_apis directory

chrome/browser/chromeos/gdata/task_util.h

-// Copyright (c) 2012 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_GDATA_TASK_UTIL_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_TASK_UTIL_H_
-
-#include "base/bind.h"
-#include "base/message_loop_proxy.h"
-
-namespace gdata {
-
-// Runs task on the thread to which |relay_proxy| belongs.
-void RunTaskOnThread(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                     const base::Closure& task);
-
-// Runs task on UI thread.
-void RunTaskOnUIThread(const base::Closure& task);
-
-namespace internal {
-
-// RelayCallback relays arguments for callback running on the given thread.
-template<typename CallbackType>
-struct RelayCallback;
-
-// RelayCallback for callback with one argument.
-template<typename T1>
-struct RelayCallback<base::Callback<void(T1)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1)>& callback,
-                  T1 arg1) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy, base::Bind(callback, arg1));
-  }
-};
-
-// RelayCallback for callback with two arguments.
-template<typename T1, typename T2>
-struct RelayCallback<base::Callback<void(T1, T2)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1, T2)>& callback,
-                  T1 arg1,
-                  T2 arg2) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy, base::Bind(callback, arg1, arg2));
-  }
-};
-
-// RelayCallback for callback with two arguments, the last one is scoped_ptr.
-template<typename T1, typename T2>
-struct RelayCallback<base::Callback<void(T1, scoped_ptr<T2>)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1, scoped_ptr<T2>)>& callback,
-                  T1 arg1,
-                  scoped_ptr<T2> arg2) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy,
-                    base::Bind(callback, arg1, base::Passed(&arg2)));
-  }
-};
-
-// RelayCallback for callback with three arguments.
-template<typename T1, typename T2, typename T3>
-struct RelayCallback<base::Callback<void(T1, T2, T3)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1, T2, T3)>& callback,
-                  T1 arg1,
-                  T2 arg2,
-                  T3 arg3) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy, base::Bind(callback, arg1, arg2, arg3));
-  }
-};
-
-// RelayCallback for callback with three arguments, the last one is scoped_ptr.
-template<typename T1, typename T2, typename T3>
-struct RelayCallback<base::Callback<void(T1, T2, scoped_ptr<T3>)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1, T2, scoped_ptr<T3>)>& callback,
-                  T1 arg1,
-                  T2 arg2,
-                  scoped_ptr<T3> arg3) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy,
-                    base::Bind(callback, arg1, arg2, base::Passed(&arg3)));
-  }
-};
-
-// RelayCallback for callback with four arguments.
-template<typename T1, typename T2, typename T3, typename T4>
-struct RelayCallback<base::Callback<void(T1, T2, T3, T4)> > {
-  static void Run(scoped_refptr<base::MessageLoopProxy> relay_proxy,
-                  const base::Callback<void(T1, T2, T3, T4)>& callback,
-                  T1 arg1,
-                  T2 arg2,
-                  T3 arg3,
-                  T4 arg4) {
-    if (callback.is_null())
-      return;
-    RunTaskOnThread(relay_proxy, base::Bind(callback, arg1, arg2, arg3, arg4));
-  }
-};
-
-}  // namespace internal
-
-// Returns callback which runs the given |callback| on the current thread.
-template<typename CallbackType>
-CallbackType CreateRelayCallback(const CallbackType& callback) {
-  return base::Bind(&internal::RelayCallback<CallbackType>::Run,
-                    base::MessageLoopProxy::current(),
-                    callback);
-}
-
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_TASK_UTIL_H_