Web MIDI backend for Windows 10

media/media_options.gni

Index: media/media_options.gni
diff --git a/media/media_options.gni b/media/media_options.gni
index 424d85658adf64fc15e94b2ef142eb19e13d26aa..aade59be41e4a28d21cac32de17ef6f7855c0af8 100644
--- a/media/media_options.gni
+++ b/media/media_options.gni
@@ -44,6 +44,11 @@ declare_args() {
   # Enable HEVC/H265 demuxing. Actual decoding must be provided by the
   # platform. Enable by default for Chromecast.
   enable_hevc_demuxing = proprietary_codecs && is_chromecast
+
+  # Enables MIDI implementation using WinRT APIs on Windows 10.
+  # TODO(shaochuan): Switch to using a runtime flag to choose between
+  # implementations.
+  midi_use_winrt = false

[Takashi Toyoshima, 2016/08/16 09:30:28]

I think it's fine to submit current CL with some TODOs left, and this could be
one of them.

In such case, this isn't a technical comment, but if you have this flag under
media/midi, you do not need to ask an extra owner's review for media/ :)

[Shao-Chuan Lee, 2016/08/18 08:48:56]

Done.

 }
 
 # Use a second declare_args() to pick up possible overrides of |use_cras|.