Add H264 bitstream rewriting to limit frame reordering marker in header

webrtc/base/bitbuffer.cc

Index: webrtc/base/bitbuffer.cc
diff --git a/webrtc/base/bitbuffer.cc b/webrtc/base/bitbuffer.cc
index 1aa245e78c7932309c8f8aa313a0177847cdd8c8..48a1d0ccdbcc8b3ed04099f095f029f8c3065b08 100644
--- a/webrtc/base/bitbuffer.cc
+++ b/webrtc/base/bitbuffer.cc
@@ -293,4 +293,18 @@ bool BitBufferWriter::WriteExponentialGolomb(uint32_t val) {
   return WriteBits(val_to_encode, CountBits(val_to_encode) * 2 - 1);
 }
 
+bool BitBufferWriter::WriteSignedExponentialGolomb(int32_t val) {
+  if (val == 0) {
+    return WriteExponentialGolomb(0);
+  } else if (val > 0) {
+    uint32_t signed_val = val;
+    return WriteExponentialGolomb((signed_val * 2) - 1);
+  } else {
+    if (val == std::numeric_limits<int32_t>::min())
+      return false;  // Not supported, would cause overflow.
+    uint32_t signed_val = -val;
+    return WriteExponentialGolomb(signed_val * 2);
+  }
+}
+
 }  // namespace rtc