Add DrFuzz support to webrtc fuzzers.

webrtc/test/fuzzers/webrtc_fuzzer_main.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-// This file is intended to provide a common interface for fuzzing functions, so
-// whether we're running fuzzing under libFuzzer or DrFuzz the webrtc functions
-// can remain the same.
-// TODO(pbos): Implement FuzzOneInput() for more than one platform (currently
-// libFuzzer).
+// This file is intended to provide a common interface for fuzzing functions.
+// It's intended to set sane defaults, such as removing logging for further

[kjellander_webrtc, 2015/12/16 22:10:26]

So no changes were actually needed for DrFuzz?

[pbos-webrtc, 2015/12/16 22:13:20]

No, zhaoqin@ added upstream support for drfuzz under the libfuzzer_main target,
so we didn't have to do that downstream. :)

+// fuzzing efficiency.
 
 #include "webrtc/base/logging.h"
 
 namespace {
 bool g_initialized = false;
 void InitializeWebRtcFuzzDefaults() {
   if (g_initialized)
     return;
 
   // Remove default logging to prevent huge slowdowns.
   // TODO(pbos): Disable in Chromium: http://crbug.com/561667
 #if !defined(WEBRTC_CHROMIUM_BUILD)
   rtc::LogMessage::LogToDebug(rtc::LS_NONE);
 #endif  // !defined(WEBRTC_CHROMIUM_BUILD)
 
   g_initialized = true;
 }
 }
 
 namespace webrtc {
 extern void FuzzOneInput(const uint8_t* data, size_t size);
 }  // namespace webrtc
 
 extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size) {
   InitializeWebRtcFuzzDefaults();
   webrtc::FuzzOneInput(data, size);
   return 0;
 }