Extend media glue code to support the VideoToolbox cast video encoder.

media/media.gyp

Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index 355312e93745729ede8145b2452204ad4001e729..f2e29052e5edb679ba5806dec895e6aec709b3eb 100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -285,6 +285,9 @@
         'base/mac/avfoundation_glue.mm',
         'base/mac/coremedia_glue.h',
         'base/mac/coremedia_glue.mm',
+        'base/mac/corevideo_glue.h',
+        'base/mac/videotoolbox_glue.h',
+        'base/mac/videotoolbox_glue.mm',
         'base/media.cc',
         'base/media.h',
         'base/media_file_checker.cc',
@@ -998,6 +1001,9 @@
             ['include', '^base/mac/avfoundation_glue\\.mm$'],
             ['include', '^base/mac/coremedia_glue\\.h$'],
             ['include', '^base/mac/coremedia_glue\\.mm$'],
+            ['include', '^base/mac/corevideo_glue\\.h$'],
+            ['include', '^base/mac/videotoolbox_glue\\.h$'],
+            ['include', '^base/mac/videotoolbox_glue\\.mm$'],
           ],
         }],
       ],  # target_conditions