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

syzygy/agent/asan/error_info.h

 // Copyright 2014 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 72 matching lines @@
 extern const char kHeapCorruptBlock[];
 extern const char kCorruptHeap[];
 
 enum AsanFeature : uint32_t {
   ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS = (1 << 0),
   // This feature flag is currently deprecated and ignored.
   DEPRECATED_ASAN_FEATURE_ENABLE_CTMALLOC = (1 << 1),
   ASAN_FEATURE_ENABLE_LARGE_BLOCK_HEAP = (1 << 2),
   // This feature flag is currently deprecated and ignored.
   DEPRECATED_ASAN_FEATURE_ENABLE_KASKO = (1 << 3),
-  ASAN_FEATURE_MAX = (1 << 4),
+  ASAN_FEATURE_ENABLE_CRASHPAD = (1 << 4),
+  ASAN_FEATURE_MAX = (1 << 5),
 };
 using AsanFeatureSet = uint32_t;
 
 // Feature set for all valid features.
 const AsanFeatureSet kAsanValidFeatures =
-    ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS | ASAN_FEATURE_ENABLE_LARGE_BLOCK_HEAP;
+    ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS |
+    ASAN_FEATURE_ENABLE_LARGE_BLOCK_HEAP | ASAN_FEATURE_ENABLE_CRASHPAD;
 
 // Feature set for all deprecated features.
 const AsanFeatureSet kAsanDeprecatedFeatures =
     DEPRECATED_ASAN_FEATURE_ENABLE_CTMALLOC |
     DEPRECATED_ASAN_FEATURE_ENABLE_KASKO;
 
 // Store the information that we want to report about a block.
 // TODO(sebmarchand): Rename this to avoid the confusion with the BlockInfo
 //     structure?
 struct AsanBlockInfo {
@@ skipping 198 matching lines @@
 // struct.
 // @param protobuf The filled in error information protobuf.
 // @param value The uninitialized AsanErrorInfo struct to be populated.
 void CrashdataProtobufToErrorInfo(const crashdata::Value& protobuf,
                                   AsanErrorInfo* error_info);
 
 }  // namespace asan
 }  // namespace agent
 
 #endif  // SYZYGY_AGENT_ASAN_ERROR_INFO_H_