[SyzyAsan] Enable Crashpad reporter as a 50/50 experiment.

syzygy/agent/asan/reporters/crashpad_reporter.cc

 // Copyright 2016 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 52 matching lines @@
     return false;
   if (!g_crashpad_client.UseHandler())
     return false;
 
   crashpad_present = true;
   return true;
 }
 
 }  // namespace
 
+const char CrashpadReporter::kName[] = "CrashpadReporter";
+
 // static
 std::unique_ptr<CrashpadReporter> CrashpadReporter::Create() {
   // Create a crashpad reporter only if a crashpad instance is running for this
   // process.
   if (!EnsureCrashpadConnected())
     return nullptr;
 
   auto crashpad_info = crashpad::CrashpadInfo::GetCrashpadInfo();
   return std::unique_ptr<CrashpadReporter>(new CrashpadReporter(crashpad_info));
 }
 
 const char* CrashpadReporter::GetName() const {
-  return "CrashpadReporter";
+  return kName;
 }
 
 uint32_t CrashpadReporter::GetFeatures() const {
   return FEATURE_CRASH_KEYS | FEATURE_EARLY_CRASH_KEYS |
       FEATURE_MEMORY_RANGES | FEATURE_CUSTOM_STREAMS |
       FEATURE_DUMP_WITHOUT_CRASH;
 }
 
 bool CrashpadReporter::SetCrashKey(base::StringPiece key,
                                    base::StringPiece value) {
@@ skipping 64 matching lines @@
 
 bool CrashpadReporter::DumpWithoutCrash(const CONTEXT& context) {
   g_crashpad_client.DumpWithoutCrash(context);
   return true;
 }
 
 CrashpadReporter::CrashpadReporter(crashpad::CrashpadInfo* crashpad_info)
     : crashpad_info_(crashpad_info) {
   crash_keys_.reset(new crashpad::SimpleStringDictionary());
 
-  // Initialize the crashpad info struct.
+  // Initialize the crashpad info struct. Limit indirectly referenced memory to
+  // a maximum of 1MB, so that crash reports come in at around 1.5-1.7MB. This
+  // is similar to the size of SyzyAsan crash reports generated by MS tools.
   crashpad_info->set_crashpad_handler_behavior(
       crashpad::TriState::kEnabled);
   crashpad_info->set_system_crash_reporter_forwarding(
       crashpad::TriState::kDisabled);
   crashpad_info->set_gather_indirectly_referenced_memory(
-      crashpad::TriState::kEnabled);
+      crashpad::TriState::kEnabled, 1 * 1024 * 1024);
   crashpad_info->set_simple_annotations(crash_keys_.get());
 }
 
 }  // namespace reporters
 }  // namespace asan
 }  // namespace agent