Create c/b/ui/cocoa/test and move test files to there

chrome/browser/ui/cocoa/run_loop_testing.mm

-// Copyright (c) 2011 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/ui/cocoa/run_loop_testing.h"
-
-#import <Foundation/Foundation.h>
-
-#include <memory>
-
-#include "base/mac/scoped_nsobject.h"
-#include "base/message_loop/message_pump_mac.h"
-
-// This class is scheduled with a delayed selector to quit the message pump.
-@interface CocoaQuitTask : NSObject {
- @private
-  base::MessagePumpNSRunLoop* pump_;
-}
-- (id)initWithMessagePump:(base::MessagePumpNSRunLoop*)pump;
-- (void)doQuit;
-@end
-
-@implementation CocoaQuitTask
-- (id)initWithMessagePump:(base::MessagePumpNSRunLoop*)pump {
-  if ((self = [super init])) {
-    pump_ = pump;
-  }
-  return self;
-}
-
-- (void)doQuit {
-  pump_->Quit();
-}
-@end
-
-////////////////////////////////////////////////////////////////////////////////
-
-namespace chrome {
-namespace testing {
-
-void NSRunLoopRunAllPending() {
-  std::unique_ptr<base::MessagePumpNSRunLoop> message_pump(
-      new base::MessagePumpNSRunLoop);
-
-  // Put a delayed selector on the queue. All other pending delayed selectors
-  // will run before this, after which the internal loop can end.
-  base::scoped_nsobject<CocoaQuitTask> quit_task(
-      [[CocoaQuitTask alloc] initWithMessagePump:message_pump.get()]);
-
-  [quit_task performSelector:@selector(doQuit)
-                  withObject:nil
-                  afterDelay:0];
-
-  // Spin the internal loop, running it until the quit task is pumped. Pass NULL
-  // because there is no delegate MessageLoop; only the Cocoa work queues will
-  // be pumped.
-  message_pump->Run(NULL);
-}
-
-}  // namespace testing
-}  // namespace chrome