VideoCaptureDeviceFactory: Change device enumeration to callback + QTKit enumerates in UI thread.

media/video/capture/fake_video_capture_device_unittest.cc

Index: media/video/capture/fake_video_capture_device_unittest.cc
diff --git a/media/video/capture/fake_video_capture_device_unittest.cc b/media/video/capture/fake_video_capture_device_unittest.cc
index 929f5ecddbf3e24984703c64587b32b8e9a915ff..c3b38e97d290d41d45203d2dff40d58cc150a148 100644
--- a/media/video/capture/fake_video_capture_device_unittest.cc
+++ b/media/video/capture/fake_video_capture_device_unittest.cc
@@ -15,6 +15,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
+using ::testing::SaveArg;
 
 namespace media {
 
@@ -53,6 +54,17 @@ class MockClient : public media::VideoCaptureDevice::Client {
   base::Callback<void(const VideoCaptureFormat&)> frame_cb_;
 };
 
+class DeviceEnumerationListener :
+    public base::RefCounted<DeviceEnumerationListener> {
+ public:
+  MOCK_METHOD1(OnEnumeratedDevicesCallback,
+               void(const media::VideoCaptureDevice::Names& names));
+
+ private:
+  friend class base::RefCounted<DeviceEnumerationListener>;
+  virtual ~DeviceEnumerationListener() {}
+};
+
 class FakeVideoCaptureDeviceTest : public testing::Test {
  protected:
   typedef media::VideoCaptureDevice::Client Client;
@@ -62,7 +74,9 @@ class FakeVideoCaptureDeviceTest : public testing::Test {
         client_(new MockClient(
             base::Bind(&FakeVideoCaptureDeviceTest::OnFrameCaptured,
                        base::Unretained(this)))),
-        video_capture_device_factory_(new FakeVideoCaptureDeviceFactory()) {}
+        video_capture_device_factory_(new FakeVideoCaptureDeviceFactory()) {
+    device_enumeration_listener_ = new DeviceEnumerationListener();
+  }
 
   virtual void SetUp() {
   }
@@ -77,12 +91,23 @@ class FakeVideoCaptureDeviceTest : public testing::Test {
     run_loop_->Run();
   }
 
+  void EnumerateDevices(VideoCaptureDevice::Names* device_names) {
+    EXPECT_CALL(*device_enumeration_listener_, OnEnumeratedDevicesCallback(_))
+        .WillOnce(SaveArg<0>(device_names));
+
+    video_capture_device_factory_->EnumerateDeviceNames(
+        base::Bind(&DeviceEnumerationListener::OnEnumeratedDevicesCallback,
+                   device_enumeration_listener_));
+    base::MessageLoop::current()->RunUntilIdle();
+  }
+
   const VideoCaptureFormat& last_format() const { return last_format_; }
 
   VideoCaptureDevice::Names names_;
   scoped_ptr<base::MessageLoop> loop_;
   scoped_ptr<base::RunLoop> run_loop_;
   scoped_ptr<MockClient> client_;
+  scoped_refptr<DeviceEnumerationListener> device_enumeration_listener_;
   VideoCaptureFormat last_format_;
   scoped_ptr<VideoCaptureDeviceFactory> video_capture_device_factory_;
 };
@@ -90,13 +115,12 @@ class FakeVideoCaptureDeviceTest : public testing::Test {
 TEST_F(FakeVideoCaptureDeviceTest, Capture) {
   VideoCaptureDevice::Names names;
 
-  video_capture_device_factory_->GetDeviceNames(&names);
+  EnumerateDevices(&names);
 
   ASSERT_GT(static_cast<int>(names.size()), 0);
 
   scoped_ptr<VideoCaptureDevice> device(
-      video_capture_device_factory_->Create(
-          base::MessageLoopProxy::current(), names.front()));
+      video_capture_device_factory_->Create(names.front()));
   ASSERT_TRUE(device);
 
   EXPECT_CALL(*client_, OnErr()).Times(0);
@@ -116,7 +140,7 @@ TEST_F(FakeVideoCaptureDeviceTest, Capture) {
 
 TEST_F(FakeVideoCaptureDeviceTest, GetDeviceSupportedFormats) {
   VideoCaptureDevice::Names names;
-  video_capture_device_factory_->GetDeviceNames(&names);
+  EnumerateDevices(&names);
 
   VideoCaptureFormats supported_formats;
   VideoCaptureDevice::Names::iterator names_iterator;
@@ -144,7 +168,7 @@ TEST_F(FakeVideoCaptureDeviceTest, GetDeviceSupportedFormats) {
 TEST_F(FakeVideoCaptureDeviceTest, CaptureVariableResolution) {
   VideoCaptureDevice::Names names;
 
-  video_capture_device_factory_->GetDeviceNames(&names);
+  EnumerateDevices(&names);
   VideoCaptureParams capture_params;
   capture_params.requested_format.frame_size.SetSize(640, 480);
   capture_params.requested_format.frame_rate = 30;
@@ -154,8 +178,7 @@ TEST_F(FakeVideoCaptureDeviceTest, CaptureVariableResolution) {
   ASSERT_GT(static_cast<int>(names.size()), 0);
 
   scoped_ptr<VideoCaptureDevice> device(
-      video_capture_device_factory_->Create(
-          base::MessageLoopProxy::current(), names.front()));
+      video_capture_device_factory_->Create(names.front()));
   ASSERT_TRUE(device);
 
   // Configure the FakeVideoCaptureDevice to use all its formats as roster.