Limit input size to iSAC and iLBC decoder fuzzers

The size limit is set to correspond to approximately 5 seconds of
decoded audio at the codecs' normal operating bitrates. This is to
avoid timeouts on the bots.

NOTRY=true

Bug: chromium:840115
Change-Id: I74b3c196259e03981aa2c4ef349e6e1334e9bf58
Reviewed-on: https://webrtc-review.googlesource.com/87302
Reviewed-by: Sam Zackrisson <saza@webrtc.org>
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23857}
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index 5204275..d811e05 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -277,6 +277,8 @@
     ":audio_decoder_fuzzer",
     "../../modules/audio_coding:ilbc",
   ]
+
+  libfuzzer_options = [ "max_len=10000" ]
 }
 
 webrtc_fuzzer_test("audio_decoder_isac_fuzzer") {
@@ -287,6 +289,8 @@
     ":audio_decoder_fuzzer",
     "../../modules/audio_coding:isac",
   ]
+
+  libfuzzer_options = [ "max_len=20000" ]
 }
 
 webrtc_fuzzer_test("audio_decoder_isac_incoming_packet_fuzzer") {
@@ -297,6 +301,8 @@
     ":audio_decoder_fuzzer",
     "../../modules/audio_coding:isac",
   ]
+
+  libfuzzer_options = [ "max_len=20000" ]
 }
 
 webrtc_fuzzer_test("audio_decoder_isacfix_fuzzer") {
@@ -307,6 +313,8 @@
     ":audio_decoder_fuzzer",
     "../../modules/audio_coding:isac_fix",
   ]
+
+  libfuzzer_options = [ "max_len=20000" ]
 }
 
 webrtc_fuzzer_test("audio_decoder_opus_fuzzer") {