Bound the impact of system instability on chrome instability.

components/browser_watcher/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//third_party/protobuf/proto_library.gni")
 
 if (is_win) {
   proto_library("stability_report_proto") {
     sources = [
       "stability_report.proto",
@@ skipping 19 matching lines @@
   static_library("browser_watcher_client") {
     sources = [
       "watcher_client_win.cc",
       "watcher_client_win.h",
       "watcher_metrics_provider_win.cc",
       "watcher_metrics_provider_win.h",
     ]
     deps = [
       ":postmortem_report_collector",
       ":stability",
+      ":system_session_analyzer",
       "//base",
       "//components/metrics",
       "//third_party/crashpad/crashpad/client",
     ]
   }
 
   static_library("postmortem_minidump_writer") {
     # TODO(manzagop): remove this lib once Crashpad writes the minidumps.
     sources = [
       "postmortem_minidump_writer.h",
@@ skipping 11 matching lines @@
 
   static_library("postmortem_report_collector") {
     sources = [
       "postmortem_report_collector.cc",
       "postmortem_report_collector.h",
     ]
     deps = [
       ":postmortem_minidump_writer",
       ":stability_data",
       ":stability_report_proto",
+      ":system_session_analyzer",
       "//base",
       "//components/variations",
       "//third_party/crashpad/crashpad/client",
       "//third_party/crashpad/crashpad/util",
     ]
   }
 }
 
 static_library("stability") {
   sources = [
     "features.cc",
     "features.h",
     "stability_debugging.cc",
     "stability_debugging.h",
   ]
   deps = [
     "//base",
   ]
 }
 
 static_library("stability_data") {
   sources = [
     "stability_data_names.cc",
     "stability_data_names.h",
   ]
 }
 
 if (is_win) {
+  static_library("system_session_analyzer") {

[Sigurður Ásgeirsson, 2017/03/01 15:09:26]

can you glom all these static libraries into one? There's - I believe - a cost
to each distinct library you add to the link, and there's no penalty for
glomming things together that I can think of.

[manzagop (departed), 2017/03/01 21:07:45]

I think I got that notion from here:
https://docs.google.com/presentation/d/15Zwb53JcncHfEwHpnG_PoIbbzQ3GQi_cpujYw...

But your suggestion makes sense. I've merged :postmortem_minidump_writer and
:system_session_analyzer into :postmortem_report_collector.

+    sources = [
+      "system_session_analyzer_win.cc",
+      "system_session_analyzer_win.h",
+    ]
+    deps = [
+      "//base",
+    ]
+    libs = [ "wevtapi.lib" ]
+    ldflags = [ "/DELAYLOAD:wevtapi.dll" ]  # Only used after unclean shutdowns.
+  }
+
   source_set("unit_tests") {
     testonly = true
     sources = [
       "endsession_watcher_window_win_unittest.cc",
       "exit_code_watcher_win_unittest.cc",
       "postmortem_minidump_writer_win_unittest.cc",
       "postmortem_report_collector_unittest.cc",
+      "system_session_analyzer_win_unittest.cc",
       "watcher_client_win_unittest.cc",
       "watcher_metrics_provider_win_unittest.cc",
       "window_hang_monitor_win_unittest.cc",
     ]
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
     deps = [
       ":browser_watcher",
       ":browser_watcher_client",
       ":postmortem_minidump_writer",
       ":postmortem_report_collector",
       ":stability_data",
       ":stability_report_proto",
+      ":system_session_analyzer",
       "//base",
       "//base/test:test_support",
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/crashpad/crashpad/client",
 
       # TODO(manzagop): remove this lib once Crashpad writes the minidumps.
       "//third_party/crashpad/crashpad/compat",
       "//third_party/crashpad/crashpad/minidump",
       "//third_party/crashpad/crashpad/snapshot",
       "//third_party/crashpad/crashpad/util",
     ]
   }
 
   executable("dump_postmortem") {
     sources = [
       "dump_postmortem_minidump_main_win.cc",
     ]
     deps = [
       ":stability_report_proto",
       "//base",
     ]
   }
+
+  executable("fetch_system_session_events") {
+    sources = [
+      "fetch_system_session_events_main_win.cc",
+    ]
+    deps = [
+      ":system_session_analyzer",
+      "//base",
+    ]
+  }
 }