Add pps id and sps id parsing to the h.264 depacketizer.

webrtc/common_video/h264/sps_vui_rewriter_unittest.cc

Index: webrtc/common_video/h264/sps_vui_rewriter_unittest.cc
diff --git a/webrtc/common_video/h264/sps_vui_rewriter_unittest.cc b/webrtc/common_video/h264/sps_vui_rewriter_unittest.cc
index 6c8baee90184eee1ce7e7430467ba6b7d5856a31..c0298ad7fa59d0cf13f9cf8ea5b9ab538b475879 100644
--- a/webrtc/common_video/h264/sps_vui_rewriter_unittest.cc
+++ b/webrtc/common_video/h264/sps_vui_rewriter_unittest.cc
@@ -164,12 +164,11 @@ void TestSps(SpsMode mode, SpsVuiRewriter::ParseResult expected_parse_result) {
   index.payload_start_offset += H264::kNaluTypeSize;
   index.payload_size -= H264::kNaluTypeSize;
 
-  std::unique_ptr<rtc::Buffer> rbsp_decoded =
-      H264::ParseRbsp(&buffer[index.payload_start_offset], index.payload_size);
   rtc::Optional<SpsParser::SpsState> sps;
   rtc::Buffer out_buffer;
-  SpsVuiRewriter::ParseResult result = SpsVuiRewriter::ParseAndRewriteSps(
-      rbsp_decoded->data(), rbsp_decoded->size(), &sps, &out_buffer);
+  SpsVuiRewriter::ParseResult result =
+      SpsVuiRewriter::ParseAndRewriteSps(&buffer[index.payload_start_offset],
+                                         index.payload_size, &sps, &out_buffer);
   EXPECT_EQ(expected_parse_result, result);
 }