Disable warnings failing when using Clang on Windows

talk/libjingle_tests.gyp

 #
 # libjingle
 # Copyright 2012 Google Inc.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #
 #  1. Redistributions of source code must retain the above copyright notice,
 #     this list of conditions and the following disclaimer.
 #  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 110 matching lines @@
             'VCLinkerTool': {
               'AdditionalDependencies': [
                 # TODO(ronghuawu): Since we've included strmiids in
                 # libjingle_media target, we shouldn't need this here.
                 # Find out why it doesn't work without this.
                 'strmiids.lib',
               ],
             },
           },
         }],
+        ['OS=="win" and clang==1', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                # Disable warnings failing when compiling with Clang on Windows.
+                # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
+                '-Wno-unused-function',
+              ],
+            },
+          },
+        },],
         ['OS=="ios"', {
           'sources!': [
             'media/sctp/sctpdataengine_unittest.cc',
           ],
         }],
       ],
     },  # target libjingle_media_unittest
     {
       'target_name': 'libjingle_p2p_unittest',
       'type': 'executable',
@@ skipping 92 matching lines @@
           # implementation. gmock supports this scenario by providing its
           # own implementation but we must opt in to it.
           'defines': [
             'GTEST_USE_OWN_TR1_TUPLE=1',
             # GTEST_USE_OWN_TR1_TUPLE only works if GTEST_HAS_TR1_TUPLE is set.
             # gmock r625 made it so that GTEST_HAS_TR1_TUPLE is set to 0
             # automatically on android, so it has to be set explicitly here.
             'GTEST_HAS_TR1_TUPLE=1',
            ],
         }],
+        ['OS=="win" and clang==1', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                # Disable warnings failing when compiling with Clang on Windows.
+                # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
+                '-Wno-unused-function',
+              ],
+            },
+          },
+        }],
       ],
     },  # target libjingle_peerconnection_unittest
   ],
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'junit_jar': '<(DEPTH)/third_party/junit-jar/junit-4.11.jar',
       },
       'targets': [
         {
@@ skipping 178 matching lines @@
             'build/isolate.gypi',
           ],
           'sources': [
             'libjingle_peerconnection_unittest.isolate',
           ],
         },
       ],
     }],
   ],
 }