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

syzygy/agent/asan/runtime_unittest.cc

Index: syzygy/agent/asan/runtime_unittest.cc
diff --git a/syzygy/agent/asan/runtime_unittest.cc b/syzygy/agent/asan/runtime_unittest.cc
index 091f8ab3efec6db5c2d11c36a8acadbff2deb8ff..4a3c2cf000b3a8adf5bdea3cfafbee6690f1eade 100644
--- a/syzygy/agent/asan/runtime_unittest.cc
+++ b/syzygy/agent/asan/runtime_unittest.cc
@@ -288,22 +288,12 @@ TEST_F(AsanRuntimeTest, PropagateFeatureSet) {
   ASSERT_NO_FATAL_FAILURE(
       asan_runtime_.SetUp(current_command_line_.GetCommandLineString()));
 
-  AsanFeatureSet valid_feature_sets[] = {
-      0,
-      ASAN_FEATURE_ENABLE_LARGE_BLOCK_HEAP,
-      ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS,
-      ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS |
-          ASAN_FEATURE_ENABLE_LARGE_BLOCK_HEAP};
-
-  size_t number_of_valid_features = 0U;
-  for (size_t i = 0; i < sizeof(kAsanValidFeatures) * 8; ++i) {
-    if ((kAsanDeprecatedFeatures & (1 << i)) != 0U)
-      number_of_valid_features++;
-  }
-
-  EXPECT_EQ(arraysize(valid_feature_sets), 1 << number_of_valid_features);
+  for (uint32_t feature_set = 0; feature_set < ASAN_FEATURE_MAX;
+       ++feature_set) {
+    // Skip feature sets that enable deprecated features.
+    if (feature_set & kAsanDeprecatedFeatures)
+      continue;
 
-  for (auto feature_set : valid_feature_sets) {
     asan_runtime_.PropagateFeatureSet(feature_set);
     ::common::AsanParameters expected_params = {};
     ::common::SetDefaultAsanParameters(&expected_params);
@@ -315,6 +305,11 @@ TEST_F(AsanRuntimeTest, PropagateFeatureSet) {
         static_cast<TestBlockHeapManager*>(asan_runtime_.heap_manager_.get());
     EXPECT_EQ(test_block_heap_manager->enable_page_protections_,
               ((feature_set & ASAN_FEATURE_ENABLE_PAGE_PROTECTIONS) != 0U));
+
+    // Expect the Crashpad bit to always be cleared, as the crash reporter
+    // can't be initialized without a Crashpad server running.
+    EXPECT_EQ(0u,
+        asan_runtime_.GetEnabledFeatureSet() & ASAN_FEATURE_ENABLE_CRASHPAD);
   }
 
   ASSERT_NO_FATAL_FAILURE(asan_runtime_.TearDown());