Add unit tests for avfoundation format mapper functions and fix wrong implementation.

webrtc/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 512 matching lines @@
 
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
       shard_timeout = 900
     }
 
     if (is_ios || is_mac) {
       deps += [
         "sdk:rtc_sdk_peerconnection_objc",
         "system_wrappers:system_wrappers_default",
+        "//third_party/ocmock",
       ]
       sources += [
         "sdk/objc/Framework/UnitTests/RTCConfigurationTest.mm",
         "sdk/objc/Framework/UnitTests/RTCDataChannelConfigurationTest.mm",
         "sdk/objc/Framework/UnitTests/RTCIceCandidateTest.mm",
         "sdk/objc/Framework/UnitTests/RTCIceServerTest.mm",
         "sdk/objc/Framework/UnitTests/RTCMediaConstraintsTest.mm",
         "sdk/objc/Framework/UnitTests/RTCSessionDescriptionTest.mm",
+        "sdk/objc/Framework/UnitTests/avformatmappertests.mm",
       ]
 
       # TODO(tkchin): Cleanup this warning.
       cflags = [ "-Wno-objc-property-no-attribute" ]
 
       # |-ObjC| flag needed to make sure category method implementations
       # are included:
       # https://developer.apple.com/library/mac/qa/qa1490/_index.html
       ldflags = [ "-ObjC" ]
     }
@@ skipping 157 matching lines @@
 
       deps = [
         "//base:base_java_test_support",
         "//webrtc/api:libjingle_peerconnection_java",
         "//webrtc/api:libjingle_peerconnection_jni",
         "//webrtc/examples:AppRTCMobile_javalib",
       ]
     }
   }
 }