Bound the impact of system instability on chrome instability.

components/browser_watcher/postmortem_report_collector.cc

Index: components/browser_watcher/postmortem_report_collector.cc
diff --git a/components/browser_watcher/postmortem_report_collector.cc b/components/browser_watcher/postmortem_report_collector.cc
index 7f5bf1457b81517991d604bfc1a754b9ef75f950..a8e9316454fbd07bbd0b4eede0ba836fff5f1e20 100644
--- a/components/browser_watcher/postmortem_report_collector.cc
+++ b/components/browser_watcher/postmortem_report_collector.cc
@@ -36,6 +36,16 @@ namespace {
 
 const char kFieldTrialKeyPrefix[] = "FieldTrial.";
 
+// DO NOT CHANGE VALUES. This is logged persistently in a histogram.
+enum SystemSessionAnalysisStatus {
+  SYSTEM_SESSION_ANALYSIS_SUCCESS = 0,
+  SYSTEM_SESSION_ANALYSIS_NO_TIMESTAMP = 1,
+  SYSTEM_SESSION_ANALYSIS_NO_ANALYZER = 2,
+  SYSTEM_SESSION_ANALYSIS_FAILED = 3,
+  SYSTEM_SESSION_ANALYSIS_OUTSIDE_RANGE = 4,
+  SYSTEM_SESSION_ANALYSIS_STATUS_MAX = 5
+};
+
 // Collects stability user data from the recorded format to the collected
 // format.
 void CollectUserData(
@@ -115,6 +125,23 @@ void CollectUserData(
   }
 }
 
+bool GetStartTimestamp(
+    const google::protobuf::Map<std::string, TypedValue>& global_data,
+    base::Time* time) {
+  DCHECK(time);
+
+  const auto& it = global_data.find(kStabilityStartTimestamp);
+  if (it == global_data.end())
+    return false;
+
+  const TypedValue& value = it->second;
+  if (value.value_case() != TypedValue::kSignedValue)
+    return false;
+
+  *time = base::Time::FromInternalValue(value.signed_value());
+  return true;
+}
+
 void CollectModuleInformation(
     const std::vector<GlobalActivityTracker::ModuleInfo>& modules,
     ProcessState* process_state) {
@@ -153,10 +180,12 @@ void CollectModuleInformation(
 PostmortemReportCollector::PostmortemReportCollector(
     const std::string& product_name,
     const std::string& version_number,
-    const std::string& channel_name)
+    const std::string& channel_name,
+    std::unique_ptr<SystemSessionAnalyzer> analyzer)
     : product_name_(product_name),
       version_number_(version_number),
-      channel_name_(channel_name) {}
+      channel_name_(channel_name),
+      system_session_analyzer_(std::move(analyzer)) {}
 
 int PostmortemReportCollector::CollectAndSubmitForUpload(
     const base::FilePath& debug_info_dir,
@@ -310,21 +339,10 @@ PostmortemReportCollector::CollectionStatus PostmortemReportCollector::Collect(
   }
 
   // Collect global user data.
-  google::protobuf::Map<std::string, TypedValue>& global_data =
-      *(*report)->mutable_global_data();
-  CollectUserData(global_data_snapshot, &global_data, report->get());
-
-  // Add the reporting Chrome's details to the report.
-  global_data[kStabilityReporterChannel].set_string_value(channel_name());
-#if defined(ARCH_CPU_X86)
-  global_data[kStabilityReporterPlatform].set_string_value(
-      std::string("Win32"));
-#elif defined(ARCH_CPU_X86_64)
-  global_data[kStabilityReporterPlatform].set_string_value(
-      std::string("Win64"));
-#endif
-  global_data[kStabilityReporterProduct].set_string_value(product_name());
-  global_data[kStabilityReporterVersion].set_string_value(version_number());
+  CollectUserData(global_data_snapshot, (*report)->mutable_global_data(),
+                  report->get());
+  SetReporterDetails(report->get());
+  DetermineSystemSate(report->get());
 
   // Collect thread activity data.
   // Note: a single process is instrumented.
@@ -352,6 +370,65 @@ PostmortemReportCollector::CollectionStatus PostmortemReportCollector::Collect(
   return SUCCESS;
 }
 
+void PostmortemReportCollector::SetReporterDetails(
+    StabilityReport* report) const {
+  DCHECK(report);
+
+  google::protobuf::Map<std::string, TypedValue>& global_data =
+      *(report->mutable_global_data());
+
+  // Reporter version details.
+  global_data[kStabilityReporterChannel].set_string_value(channel_name());
+#if defined(ARCH_CPU_X86)
+  global_data[kStabilityReporterPlatform].set_string_value(
+      std::string("Win32"));
+#elif defined(ARCH_CPU_X86_64)
+  global_data[kStabilityReporterPlatform].set_string_value(
+      std::string("Win64"));
+#endif
+  global_data[kStabilityReporterProduct].set_string_value(product_name());
+  global_data[kStabilityReporterVersion].set_string_value(version_number());
+}
+
+void PostmortemReportCollector::DetermineSystemSate(
+    StabilityReport* report) const {
+  DCHECK(report);
+
+  // A session state for the stability report: was the system session clean?
+  SystemState::SessionState session_state = SystemState::UNKNOWN;
+  // An analasis status for metrics: did the analysis succeed?
+  SystemSessionAnalysisStatus status = SYSTEM_SESSION_ANALYSIS_SUCCESS;
+
+  base::Time time;
+  if (!GetStartTimestamp(report->global_data(), &time)) {
+    status = SYSTEM_SESSION_ANALYSIS_NO_TIMESTAMP;
+  } else if (!system_session_analyzer_) {
+    status = SYSTEM_SESSION_ANALYSIS_NO_ANALYZER;
+  } else {
+    SystemSessionAnalyzer::Status analyzer_status =
+        system_session_analyzer_->IsSessionUnclean(time);
+    switch (analyzer_status) {
+      case SystemSessionAnalyzer::FAILED:
+        status = SYSTEM_SESSION_ANALYSIS_FAILED;
+        break;
+      case SystemSessionAnalyzer::CLEAN:
+        session_state = SystemState::CLEAN;
+        break;
+      case SystemSessionAnalyzer::UNCLEAN:
+        session_state = SystemState::UNCLEAN;
+        break;
+      case SystemSessionAnalyzer::OUTSIDE_RANGE:
+        status = SYSTEM_SESSION_ANALYSIS_OUTSIDE_RANGE;
+        break;
+    }
+  }
+
+  report->mutable_system_state()->set_session_state(session_state);
+  UMA_HISTOGRAM_ENUMERATION(
+      "ActivityTracker.Collect.SystemSessionAnalysisStatus", status,
+      SYSTEM_SESSION_ANALYSIS_STATUS_MAX);
+}
+
 void PostmortemReportCollector::CollectThread(
     const base::debug::ThreadActivityAnalyzer::Snapshot& snapshot,
     ThreadState* thread_state) {