Add third_party/openscreen/src to DEPS

This change adds the Open Screen Protocol library to DEPS so that our
team can begin working on Chromium integration and testing ahead of its
completion.

Change-Id: I52ebca0b3eb890b4be2529b4cbb99a944e5133eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1480703Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638280}

DEPS

@@ -1095,6 +1095,9 @@ deps = {
   'src/third_party/openmax_dl':
     Var('webrtc_git') + '/deps/third_party/openmax.git' + '@' +  Var('openmax_dl_revision'),
 
+  'src/third_party/openscreen/src':
+    Var('chromium_git') + '/openscreen' + '@' + 'b1d095ba4f8f3ec1efd90dbd5cb0a37e5b4b21f7',
+
   'src/third_party/ow2_asm': {
       'packages': [
           {
@@ -2868,6 +2871,7 @@ hooks = [
 recursedeps = [
   # ANGLE manages DEPS that it also owns the build files for, such as dEQP.
   "src/third_party/angle",
+  'src/third_party/openscreen/src',
   # src-internal has its own DEPS file to pull additional internal repos
   'src-internal',
 ]

third_party/.gitignore

@@ -163,6 +163,7 @@
 /omaha/src/omaha
 /openmax_dl/
 /openh264/src
+/openscreen/src
 /ow2_asm/lib/
 /pdfsqueeze
 /pdfium

third_party/openscreen/OWNERS

+mfoltz@chromium.org
+btolsch@chromium.org
+pthatcher@chromium.org

third_party/openscreen/README.chromium

+Name: Open Screen Protocol Library
+Short Name: openscreen
+URL: https://chromium.googlesource.com/openscreen
+Version: 0
+Revision: 9499a256bc609e9efdf15a268fd047127870af41
+License: BSD
+License File: src/LICENSE
+Security Critical: yes
+License Android Compatible: yes
+
+Description:
+This implements the Open Screen Protocol.  Open Screen Protocol is an open
+source implementation of a network protocol necessary to implement, among other
+things, the Presentation API.  For the working draft spec, see
+https://github.com/webscreens/openscreenprotocol/.