Bound the impact of system instability on chrome instability.

components/browser_watcher/BUILD.gn

Index: components/browser_watcher/BUILD.gn
diff --git a/components/browser_watcher/BUILD.gn b/components/browser_watcher/BUILD.gn
index 2e831c9c8b1d370dc280031ca2bc6089882a08f3..47892c6f3e7ab14f04a76c7715f37d5f94582ea1 100644
--- a/components/browser_watcher/BUILD.gn
+++ b/components/browser_watcher/BUILD.gn
@@ -37,6 +37,7 @@ if (is_win) {
     deps = [
       ":postmortem_report_collector",
       ":stability",
+      ":system_session_analyzer",
       "//base",
       "//components/metrics",
       "//third_party/crashpad/crashpad/client",
@@ -68,6 +69,7 @@ if (is_win) {
       ":postmortem_minidump_writer",
       ":stability_data",
       ":stability_report_proto",
+      ":system_session_analyzer",
       "//base",
       "//components/variations",
       "//third_party/crashpad/crashpad/client",
@@ -96,6 +98,18 @@ static_library("stability_data") {
 }
 
 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 = [
@@ -103,6 +117,7 @@ if (is_win) {
       "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",
@@ -115,6 +130,7 @@ if (is_win) {
       ":postmortem_report_collector",
       ":stability_data",
       ":stability_report_proto",
+      ":system_session_analyzer",
       "//base",
       "//base/test:test_support",
       "//testing/gmock",
@@ -138,4 +154,14 @@ if (is_win) {
       "//base",
     ]
   }
+
+  executable("fetch_system_session_events") {
+    sources = [
+      "fetch_system_session_events_main_win.cc",
+    ]
+    deps = [
+      ":system_session_analyzer",
+      "//base",
+    ]
+  }
 }