Added AVFoundation Glue and Device Monitoring for Mac.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 09deb821b2230694d4d3672bbc6285ee95e8eaa5..a46333e25432c018fa9c63a646b710a7e0e0a4aa 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -395,6 +395,8 @@
         'video/capture/fake_video_capture_device.h',
         'video/capture/linux/video_capture_device_linux.cc',
         'video/capture/linux/video_capture_device_linux.h',
+        'video/capture/mac/avfoundation_glue.h',
+        'video/capture/mac/avfoundation_glue.mm',
         'video/capture/mac/video_capture_device_mac.h',
         'video/capture/mac/video_capture_device_mac.mm',
         'video/capture/mac/video_capture_device_qtkit_mac.h',
@@ -1471,7 +1473,7 @@
             'template_deps': ['video/capture/android/imageformat_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
-        },                  
+        },
       ],
     }],
     ['media_use_ffmpeg==1', {