Mac VideoCapture: Support for Blackmagic DeckLink device & capabilities enumeration, using SDK.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 71242666b7c665bd6af08c51b187190979576877..114ca971c85a33ba3292eda207b6864eaef439f9 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -497,6 +497,8 @@
         'video/capture/mac/platform_video_capturing_mac.h',
         'video/capture/mac/video_capture_device_avfoundation_mac.h',
         'video/capture/mac/video_capture_device_avfoundation_mac.mm',
+        'video/capture/mac/video_capture_device_decklink_mac.h',
+        'video/capture/mac/video_capture_device_decklink_mac.mm',
         'video/capture/mac/video_capture_device_factory_mac.h',
         'video/capture/mac/video_capture_device_factory_mac.mm',
         'video/capture/mac/video_capture_device_mac.h',
@@ -866,6 +868,9 @@
           ],
         }],
         ['OS=="mac"', {
+          'dependencies': [
+            '../third_party/decklink/decklink.gyp:decklink',
+          ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AudioToolbox.framework',