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

content/browser/renderer_host/media/video_capture_controller_unittest.cc

Index: content/browser/renderer_host/media/video_capture_controller_unittest.cc
diff --git a/content/browser/renderer_host/media/video_capture_controller_unittest.cc b/content/browser/renderer_host/media/video_capture_controller_unittest.cc
index 47c0c29786d9234d54828c40f114fd7a21b8666b..f381b262b53a8e4068adb95eb65e806688c8e80c 100644
--- a/content/browser/renderer_host/media/video_capture_controller_unittest.cc
+++ b/content/browser/renderer_host/media/video_capture_controller_unittest.cc
@@ -100,8 +100,9 @@ class MockVideoCaptureControllerEventHandler
 class MockVideoCaptureManager
     : public media_stream::VideoCaptureManager {
  public:
-  MockVideoCaptureManager()
-      : video_session_id_(kStartOpenSessionId) {}
+  MockVideoCaptureManager(scoped_refptr<base::MessageLoopProxy> message_loop)
+      : media_stream::VideoCaptureManager(message_loop),
+        video_session_id_(kStartOpenSessionId) {}
 
   void Init() {
     device_name_.unique_id = "/dev/video0";
@@ -158,7 +159,10 @@ class VideoCaptureControllerTest : public testing::Test {
     io_thread_.reset(new BrowserThreadImpl(BrowserThread::IO,
                                            message_loop_.get()));
 
-    vcm_ = new MockVideoCaptureManager();
+    device_thread_.reset(new base::Thread("VideoCaptureControllerTestThread"));
+    CHECK(device_thread_->Start());
+
+    vcm_ = new MockVideoCaptureManager(device_thread_->message_loop_proxy());
     vcm_->Init();
     controller_ = new VideoCaptureController(vcm_);
     controller_handler_.reset(
@@ -167,11 +171,13 @@ class VideoCaptureControllerTest : public testing::Test {
   }
 
   virtual void TearDown() {
+    device_thread_->Stop();
   }
 
   scoped_ptr<MessageLoop> message_loop_;
   scoped_ptr<BrowserThreadImpl> file_thread_;
   scoped_ptr<BrowserThreadImpl> io_thread_;
+  scoped_ptr<base::Thread> device_thread_;
   scoped_refptr<MockVideoCaptureManager> vcm_;
   scoped_ptr<MockVideoCaptureControllerEventHandler> controller_handler_;
   scoped_refptr<VideoCaptureController> controller_;