Move the device enumerate/open/close work to device thread from IO thread

content/browser/renderer_host/media/video_capture_controller_unittest.cc

 // 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.
 
 // Unit test for VideoCaptureController.
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
@@ skipping 133 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MockVideoCaptureManager);
 };
 
 // Test class.
 class VideoCaptureControllerTest : public testing::Test {
  public:
   VideoCaptureControllerTest() {}
   virtual ~VideoCaptureControllerTest() {}
 
  protected:
-  virtual void SetUp() {
+  virtual void SetUp() OVERRIDE {
     message_loop_.reset(new MessageLoop(MessageLoop::TYPE_IO));
     file_thread_.reset(new BrowserThreadImpl(BrowserThread::FILE,
                                              message_loop_.get()));
     io_thread_.reset(new BrowserThreadImpl(BrowserThread::IO,
                                            message_loop_.get()));
 
     vcm_ = new MockVideoCaptureManager();
     vcm_->Init();
     controller_ = new VideoCaptureController(vcm_);
     controller_handler_.reset(
         new MockVideoCaptureControllerEventHandler(controller_.get(),
                                                    message_loop_.get()));
   }
 
-  virtual void TearDown() {
-  }
+  virtual void TearDown() OVERRIDE {}
 
   scoped_ptr<MessageLoop> message_loop_;
   scoped_ptr<BrowserThreadImpl> file_thread_;
   scoped_ptr<BrowserThreadImpl> io_thread_;
   scoped_refptr<MockVideoCaptureManager> vcm_;
   scoped_ptr<MockVideoCaptureControllerEventHandler> controller_handler_;
   scoped_refptr<VideoCaptureController> controller_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureControllerTest);
@@ skipping 81 matching lines @@
   message_loop_->PostDelayedTask(
       FROM_HERE, MessageLoop::QuitClosure(), base::TimeDelta::FromSeconds(1));
   message_loop_->Run();
 
   EXPECT_CALL(*vcm_,
               StopCapture(vcm_->video_session_id_))
       .Times(1);
   controller_->StopCapture(controller_handler_->controller_id_,
                            controller_handler_.get());
 }