Instrument some of the exit paths likely to suffer hangs.

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/views/frame/browser_desktop_window_tree_host_win.h"
 
 #include <dwmapi.h>
 
+#include "base/process/process_handle.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/browser/ui/views/frame/browser_frame.h"
 #include "chrome/browser/ui/views/frame/browser_frame_common_win.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/frame/browser_window_property_manager_win.h"
 #include "chrome/browser/ui/views/frame/system_menu_insertion_delegate_win.h"
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
 #include "chrome/browser/ui/views/theme_image_mapper.h"
+#include "chrome/common/chrome_constants.h"
+#include "components/browser_watcher/exit_funnel_win.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/win/dpi.h"
 #include "ui/views/controls/menu/native_menu_win.h"
 
 #pragma comment(lib, "dwmapi.lib")
 
 namespace {
 
 const int kClientEdgeThickness = 3;
 // We need to offset the DWMFrame into the toolbar so that the blackness
@@ skipping 34 matching lines @@
       ui::ScaleFactor scale_factor) const override {
     return delegate_->GetRawData(id, scale_factor);
   }
 
  private:
   ui::ThemeProvider* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopThemeProvider);
 };
 
+// See http://crbug.com/412384.
+void TraceSessionEnding(LPARAM lparam) {
+  browser_watcher::ExitFunnel funnel;
+  if (!funnel.Init(chrome::kBrowserExitCodesRegistryPath,
+                   base::GetCurrentProcessHandle())) {
+    return;
+  }
+
+  // This exit path is the prime suspect for most our unclean shutdowns.
+  // Trace all the possible options to WM_ENDSESSION. This may result in
+  // multiple events for a single shutdown, but that's fine.
+  funnel.RecordEvent(L"WM_ENDSESSION");
+
+  if (lparam & ENDSESSION_CLOSEAPP)
+    funnel.RecordEvent(L"ES_CloseApp");
+  if (lparam & ENDSESSION_CRITICAL)
+    funnel.RecordEvent(L"ES_Critical");
+  if (lparam & ENDSESSION_LOGOFF)
+    funnel.RecordEvent(L"ES_Logoff");
+  const LPARAM kKnownBits =
+      ENDSESSION_CLOSEAPP | ENDSESSION_CRITICAL | ENDSESSION_LOGOFF;
+  if (lparam & ~kKnownBits)
+    funnel.RecordEvent(L"ES_Other");
+}
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserDesktopWindowTreeHostWin, public:
 
 BrowserDesktopWindowTreeHostWin::BrowserDesktopWindowTreeHostWin(
     views::internal::NativeWidgetDelegate* native_widget_delegate,
     views::DesktopNativeWidgetAura* desktop_native_widget_aura,
     BrowserView* browser_view,
     BrowserFrame* browser_frame)
@@ skipping 92 matching lines @@
 bool BrowserDesktopWindowTreeHostWin::PreHandleMSG(UINT message,
                                                    WPARAM w_param,
                                                    LPARAM l_param,
                                                    LRESULT* result) {
   switch (message) {
     case WM_ACTIVATE:
       if (LOWORD(w_param) != WA_INACTIVE)
         minimize_button_metrics_.OnHWNDActivated();
       return false;
     case WM_ENDSESSION:
+      TraceSessionEnding(l_param);
       chrome::SessionEnding();
       return true;
     case WM_INITMENUPOPUP:
       GetSystemMenu()->UpdateStates();
       return true;
   }
   return DesktopWindowTreeHostWin::PreHandleMSG(
       message, w_param, l_param, result);
 }
 
@@ skipping 131 matching lines @@
     BrowserDesktopWindowTreeHost::CreateBrowserDesktopWindowTreeHost(
         views::internal::NativeWidgetDelegate* native_widget_delegate,
         views::DesktopNativeWidgetAura* desktop_native_widget_aura,
         BrowserView* browser_view,
         BrowserFrame* browser_frame) {
   return new BrowserDesktopWindowTreeHostWin(native_widget_delegate,
                                              desktop_native_widget_aura,
                                              browser_view,
                                              browser_frame);
 }