GWP-ASan: Enable by default on Windows/macOS

Enable GWP-ASan for malloc and PartitionAlloc by default for Windows and
macOS and delete the former field trial config used to launch GWP-ASan.

Bug: 896019, 912286, 956824
Change-Id: Icd146bc63dd6e50e6c5319905ed2f761ebff1bb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866604
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707356}

components/gwp_asan/client/gwp_asan.cc

@@ -36,8 +36,8 @@ namespace gwp_asan {
 namespace internal {
 namespace {
 
-constexpr int kDefaultMaxAllocations = 35;
-constexpr int kDefaultMaxMetadata = 150;
+constexpr int kDefaultMaxAllocations = 70;
+constexpr int kDefaultMaxMetadata = 255;
 
 #if defined(ARCH_CPU_64_BITS)
 constexpr int kDefaultTotalPages = 2048;
@@ -51,17 +51,23 @@ constexpr int kDefaultTotalPages = kDefaultMaxMetadata * 2;
 // multiplier * range**rand
 // where rand is a random real number in the range [0,1).
 constexpr int kDefaultAllocationSamplingMultiplier = 1000;
-constexpr int kDefaultAllocationSamplingRange = 64;
+constexpr int kDefaultAllocationSamplingRange = 16;
 
-constexpr double kDefaultProcessSamplingProbability = 0.2;
+constexpr double kDefaultProcessSamplingProbability = 0.015;
 // The multiplier to increase the ProcessSamplingProbability in scenarios where
 // we want to perform additional testing (e.g., on canary/dev builds).
-constexpr int kDefaultProcessSamplingBoost2 = 5;
+constexpr int kDefaultProcessSamplingBoost2 = 10;
 
-const base::Feature kGwpAsanMalloc{"GwpAsanMalloc",
-                                   base::FEATURE_DISABLED_BY_DEFAULT};
+#if defined(OS_WIN) || defined(OS_MACOSX)
+constexpr base::FeatureState kDefaultEnabled = base::FEATURE_ENABLED_BY_DEFAULT;
+#else
+constexpr base::FeatureState kDefaultEnabled =
+    base::FEATURE_DISABLED_BY_DEFAULT;
+#endif
+
+const base::Feature kGwpAsanMalloc{"GwpAsanMalloc", kDefaultEnabled};
 const base::Feature kGwpAsanPartitionAlloc{"GwpAsanPartitionAlloc",
-                                           base::FEATURE_DISABLED_BY_DEFAULT};
+                                           kDefaultEnabled};
 
 // Returns whether this process should be sampled to enable GWP-ASan.
 bool SampleProcess(const base::Feature& feature, bool boost_sampling) {

testing/variations/fieldtrial_testing_config.json

@@ -2860,30 +2860,6 @@
             ]
         }
     ],
-    "GwpAsanUnified": [
-        {
-            "platforms": [
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "params": {
-                        "AllocationSamplingRange": "16",
-                        "MaxAllocations": "70",
-                        "MaxMetadata": "255",
-                        "ProcessSamplingBoost2": "10",
-                        "ProcessSamplingProbability": "0.015"
-                    },
-                    "enable_features": [
-                        "GwpAsanMalloc",
-                        "GwpAsanPartitionAlloc"
-                    ]
-                }
-            ]
-        }
-    ],
     "HTTPReallyBadFinal": [
         {
             "platforms": [