ChromeFrame tabs would hang at times while closing. This would randomly occur...

chrome_frame/chrome_frame_activex_base.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_
 #define CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <atlctl.h>
@@ skipping 343 matching lines @@
   // mode, in which case we always trust our container so we return false.
   bool is_frame_busting_enabled() const {
     return !is_privileged_;
   }
 
   // Needed to support PostTask.
   static bool ImplementsThreadSafeReferenceCounting() {
     return true;
   }
 
+  // IOleInPlaceObject overrides.
+  STDMETHOD(InPlaceDeactivate)(void) {
+    static UINT onload_handlers_done_msg =
+        RegisterWindowMessage(L"ChromeFrame_OnloadHandlersDone");
+
+    if (m_bInPlaceActive && IsWindow() && IsValid()) {
+      static const int kChromeFrameUnloadEventTimerId = 0xdeadbeef;
+      static const int kChromeFrameUnloadEventTimeout = 1000;
+
+      // To prevent us from indefinitely waiting for an acknowledgement from
+      // Chrome indicating that unload handlers have been run, we set a 1
+      // second timer and exit the loop when it fires.
+      ::SetTimer(m_hWnd, kChromeFrameUnloadEventTimerId,
+                 kChromeFrameUnloadEventTimeout, NULL);
+
+      automation_client_->RunUnloadHandlers(m_hWnd, onload_handlers_done_msg);
+
+      MSG msg = {0};
+      while (GetMessage(&msg, NULL, 0, 0)) {
+        if (msg.message == onload_handlers_done_msg &&
+            msg.hwnd == m_hWnd) {
+          break;
+        }
+
+        if (msg.message == WM_TIMER &&
+            msg.wParam == kChromeFrameUnloadEventTimerId) {
+          break;
+        }
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+      }
+
+      ::KillTimer(m_hWnd, kChromeFrameUnloadEventTimerId);
+    }
+    return IOleInPlaceObjectWindowlessImpl<T>::InPlaceDeactivate();
+  }
+
  protected:
   virtual void GetProfilePath(const std::wstring& profile_name,
                               FilePath* profile_path) {
     bool is_IE = (lstrcmpi(profile_name.c_str(), kIexploreProfileName) == 0) ||
                  (lstrcmpi(profile_name.c_str(), kRundllProfileName) == 0);
     // Browsers without IDeleteBrowsingHistory in non-priv mode
     // have their profiles moved into "Temporary Internet Files".
     if (is_IE && GetIEVersion() < IE_8 && !is_privileged_) {
       *profile_path = GetIETemporaryFilesFolder();
       *profile_path = profile_path->Append(L"Google Chrome Frame");
@@ skipping 768 matching lines @@
   EventHandlers onreadystatechanged_;
   EventHandlers onprivatemessage_;
   EventHandlers onextensionready_;
 
   // Handle network requests when host network stack is used. Passed to the
   // automation client on initialization.
   UrlmonUrlRequestManager url_fetcher_;
 };
 
 #endif  // CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_