Add H264 packetizer fuzzer

BUG=webrtc:15755

Change-Id: I384fbdfa3a2aea8faaf53eb161cecc2c8639401d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/332600
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#41487}
diff --git a/whitespace.txt b/whitespace.txt
index ea60e61..e4ba9ab 100644
--- a/whitespace.txt
+++ b/whitespace.txt
@@ -2,6 +2,6 @@
 Try to write something funny. And please don't add trailing whitespace.
 
 
-Once upon a time there was an elephant in Stockholm.
+Once upon a time there was a white elephant in Stockholm.
 Why did the elephant get kicked out of the Swedish Parliament?
 Because it kept making trunk calls!