Skip AUD while extracting SPS and PPS on iOS.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc

Index: webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc
diff --git a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc
index 4ac9cd0db192e8290bde3ab5ee7e4748b610d3aa..a263707f4acade71b5304f4b98c9d487b3ea1802 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc
+++ b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc
@@ -27,9 +27,17 @@ TEST(H264VideoToolboxNaluTest, TestHasVideoFormatDescription) {
   const uint8_t sps_buffer[] = {0x00, 0x00, 0x00, 0x01, 0x27};
   EXPECT_TRUE(H264AnnexBBufferHasVideoFormatDescription(sps_buffer,
                                                         arraysize(sps_buffer)));
+  const uint8_t aud_sps_buffer[] = {0x00, 0x00, 0x00, 0x01, 0x29,
+                                    0x00, 0x00, 0x00, 0x01, 0x27};
+  EXPECT_TRUE(H264AnnexBBufferHasVideoFormatDescription(
+      aud_sps_buffer, arraysize(aud_sps_buffer)));
   const uint8_t other_buffer[] = {0x00, 0x00, 0x00, 0x01, 0x28};
   EXPECT_FALSE(H264AnnexBBufferHasVideoFormatDescription(
       other_buffer, arraysize(other_buffer)));
+  const uint8_t aud_other_buffer[] = {0x00, 0x00, 0x00, 0x01, 0x29,
+                                      0x00, 0x00, 0x00, 0x01, 0x28};
+  EXPECT_FALSE(H264AnnexBBufferHasVideoFormatDescription(
+      aud_other_buffer, arraysize(aud_other_buffer)));
 }
 
 TEST(H264VideoToolboxNaluTest, TestCreateVideoFormatDescription) {