Mac Video Capture: Support for Blackmagic DeckLink SDK video capture.

media/video/capture/mac/video_capture_device_factory_mac.mm

Index: media/video/capture/mac/video_capture_device_factory_mac.mm
diff --git a/media/video/capture/mac/video_capture_device_factory_mac.mm b/media/video/capture/mac/video_capture_device_factory_mac.mm
index f5a6a1cec44d3cc2877ee8b8d65e64f311dd3d11..3f758ca1e703470ae8e23f50ad7d323ad6829cfc 100644
--- a/media/video/capture/mac/video_capture_device_factory_mac.mm
+++ b/media/video/capture/mac/video_capture_device_factory_mac.mm
@@ -98,11 +98,16 @@ scoped_ptr<VideoCaptureDevice> VideoCaptureDeviceFactoryMac::Create(
       return scoped_ptr<VideoCaptureDevice>();
   }
 
-  scoped_ptr<VideoCaptureDeviceMac> capture_device(
-      new VideoCaptureDeviceMac(device_name));
-  if (!capture_device->Init(device_name.capture_api_type())) {
-    LOG(ERROR) << "Could not initialize VideoCaptureDevice.";
-    capture_device.reset();
+  scoped_ptr<VideoCaptureDevice> capture_device;
+  if (device_name.capture_api_type() == VideoCaptureDevice::Name::DECKLINK) {
+    capture_device.reset(new VideoCaptureDeviceDeckLinkMac(device_name));
+  } else {
+    VideoCaptureDeviceMac* device = new VideoCaptureDeviceMac(device_name);
+    capture_device.reset(device);
+    if (device->Init(device_name.capture_api_type())) {
+      LOG(ERROR) << "Could not initialize VideoCaptureDevice.";
+      capture_device.reset();
+    }
   }
   return scoped_ptr<VideoCaptureDevice>(capture_device.Pass());
 }