Update documentation for THIRD_PARTY_DEPS; add pymock.

This should fix our python presubmit tests.

Also make Artem and Patrik own the deps file.

Bug: webrtc:9264
Change-Id: I430c56e0b12c4feac7d7cbf766eea9e304cd9a20
Reviewed-on: https://webrtc-review.googlesource.com/76421
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23217}

OWNERS

@@ -14,6 +14,8 @@ per-file AUTHORS=*
 per-file BUILD.gn=phoglund@webrtc.org
 per-file DEPS=*
 per-file pylintrc=phoglund@webrtc.org
+per-file THIRD_PARTY_DEPS=phoglund@webrtc.org
+per-file THIRD_PARTY_DEPS=titovartem@webrtc.org
 per-file WATCHLISTS=*
 per-file style-guide.md=danilchap@webrtc.org
 per-file style-guide.md=kwiberg@webrtc.org

THIRD_PARTY_DEPS

@@ -1,3 +1,22 @@
+# This file determines which parts of Chromium's third_party/ we copy.
+# If a dependency is missing, add <dep> to the DEPS list in order to start
+# copying third_party/<dep> from Chromium's third_party.
+#
+# Test your change like this:
+# 1. Edit this file
+# 2. Add
+#   "custom_vars": {
+#     "roll_chromium_into_webrtc": True,
+#   },
+#   to the WebRTC solution in your gclient.
+# 3. gclient sync --deps=all
+# 4. python tools_webrtc/autoroller/roll_deps.py --dry-run --ignore-unclean-workdir
+# 5. git checkout -- . # Throw away rolls of existing deps.
+# 6. You should now get untracked files in third_party/<dep>.
+# 7. git add third_party/<dep>
+# 8. git commit -am "Add third_party/<dep> to WebRTC"
+# 9. git cl upload
+
 DEPS = [
   # Common
   'binutils',
@@ -15,6 +34,7 @@ DEPS = [
   'openh264',
   'opus',
   'protobuf',
+  'pymock',
   'requests',
   'rnnoise',
   'usrsctp',

third_party/pymock/LICENSE.txt

@@ -0,0 +1,26 @@
+Copyright (c) 2003-2012, Michael Foord
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

third_party/pymock/OWNERS

@@ -0,0 +1 @@
+sbc@chromium.org

third_party/pymock/README.chromium

@@ -0,0 +1,10 @@
+Name: mock
+URL: http://pypi.python.org/pypi/mock
+Version: 1.0.1
+Security Critical: no
+License: BSD
+License File: NOT_SHIPPED
+Description:
+Python mock library, currently used by native_client_sdk.  This is the
+same mock library that is now part of python 3.3 where it is know as
+unittest.mock.