Port parts of //third_pary/libjingle build to GN

third_party/libjingle/libjingle.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../../build/win_precompile.gypi',
   ],
   'variables': {
     'enabled_libjingle_device_manager%': 0,
     'libjingle_additional_deps%': [],
     'libjingle_peerconnection_additional_deps%': [],
     'libjingle_source%': "source",
     'libpeer_target_type%': 'static_library',
     'libpeer_allocator_shim%': 0,
   },
+  # Most of these settings have been split according to their scope into
+  # :jingle_unexported_configs, :jingle_direct_dependent_configs,
+  # :jingle_all_dependent_configs in the GN build.
   'target_defaults': {
     'defines': [
       'EXPAT_RELATIVE_PATH',
       'FEATURE_ENABLE_SSL',
       'GTEST_RELATIVE_PATH',
       'HAVE_SRTP',
       'HAVE_WEBRTC_VIDEO',
       'HAVE_WEBRTC_VOICE',
       'LOGGING_INSIDE_WEBRTC',
       'NO_MAIN_THREAD_WRAPPING',
@@ skipping 14 matching lines @@
     'include_dirs': [
       './overrides',
       '../../third_party/webrtc/overrides',
       './<(libjingle_source)',
       '../..',
       '../../testing/gtest/include',
       '../../third_party',
       '../../third_party/libyuv/include',
       '../../third_party/usrsctp',
     ],
+    # These dependencies have been translated into :jingle_deps in the GN build.
     'dependencies': [
       '<(DEPTH)/base/base.gyp:base',
       '<(DEPTH)/net/net.gyp:net',
       '<(DEPTH)/third_party/expat/expat.gyp:expat',
     ],
     'export_dependent_settings': [
       '<(DEPTH)/third_party/expat/expat.gyp:expat',
     ],
     'direct_dependent_settings': {
       'include_dirs': [
@@ skipping 86 matching lines @@
           'defines': [
             'CHROMEOS',
           ],
         }],
       ],
     },
     'all_dependent_settings': {
       'configurations': {
         'Debug': {
           'defines': [
-            # TODO(sergeyu): Fix libjingle to use NDEBUG instead of
-            # _DEBUG and remove this define. See above as well.
+            # TODO(sergeyu): Fix libjingle to use NDEBUG instead of _DEBUG and
+            # remove this define. See above and GN file as well.
             '_DEBUG',
           ],
         }
       },
     },
     'variables': {
       'clang_warning_flags_unset': [
         # Don't warn about string->bool used in asserts.
         '-Wstring-conversion',
       ],
@@ skipping 84 matching lines @@
         ],
       }],
       ['OS=="freebsd"', {
         'defines': [
           'FREEBSD',
         ],
       }],
     ],
   },
   'targets': [
+    # GN version: //third_party/libjingle
     {
       'target_name': 'libjingle',
       'type': 'static_library',
       'includes': [ 'libjingle_common.gypi' ],
       'sources!' : [
         # Compiled as part of libjingle_p2p_constants.
         '<(libjingle_source)/talk/p2p/base/constants.cc',
         '<(libjingle_source)/talk/p2p/base/constants.h',
       ],
       'dependencies': [
         '<(DEPTH)/third_party/webrtc/base/base.gyp:webrtc_base',
         'libjingle_p2p_constants',
         '<@(libjingle_additional_deps)',
       ],
     },  # target libjingle
     # This has to be is a separate project due to a bug in MSVS 2008 and the
     # current toolset on android.  The problem is that we have two files named
     # "constants.cc" and MSVS/android doesn't handle this properly.
     # GYP currently has guards to catch this, so if you want to remove it,
     # run GYP and if GYP has removed the validation check, then we can assume
     # that the toolchains have been fixed (we currently use VS2010 and later,
     # so VS2008 isn't a concern anymore).
+    #
+    # GN version: //third_party/libjingle:libjingle_p2p_constants
     {
       'target_name': 'libjingle_p2p_constants',
       'type': 'static_library',
       'sources': [
         '<(libjingle_source)/talk/p2p/base/constants.cc',
         '<(libjingle_source)/talk/p2p/base/constants.h',
       ],
     },  # target libjingle_p2p_constants
+    # GN version: //third_party/libjingle:peerconnection_server
     {
       'target_name': 'peerconnection_server',
       'type': 'executable',
       'sources': [
         '<(libjingle_source)/talk/examples/peerconnection/server/data_socket.cc',
         '<(libjingle_source)/talk/examples/peerconnection/server/data_socket.h',
         '<(libjingle_source)/talk/examples/peerconnection/server/main.cc',
         '<(libjingle_source)/talk/examples/peerconnection/server/peer_channel.cc',
         '<(libjingle_source)/talk/examples/peerconnection/server/peer_channel.h',
         '<(libjingle_source)/talk/examples/peerconnection/server/utils.cc',
@@ skipping 344 matching lines @@
               # in this directory and not lib.target as will otherwise be
               # the case with make builds.
               'product_dir': '<(PRODUCT_DIR)/lib',
             }],
           ],
         },  # target libpeerconnection
       ],
     }],
   ],
 }