Disables tooltips if we can't create the tooltip window. I still don't

views/widget/native_widget_win.cc

 // Copyright (c) 2011 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 "views/widget/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "base/string_util.h"
@@ skipping 1144 matching lines @@
 
   // Windows special DWM window frame requires a special tooltip manager so
   // that window controls in Chrome windows don't flicker when you move your
   // mouse over them. See comment in aero_tooltip_manager.h.
   Window* window = GetWidget()->GetContainingWindow();
   if (window && window->ShouldUseNativeFrame()) {
     tooltip_manager_.reset(new AeroTooltipManager(GetWidget()));
   } else {
     tooltip_manager_.reset(new TooltipManagerWin(GetWidget()));
   }
+  if (!tooltip_manager_->Init()) {

[Ben Goodger (Google), 2011/06/13 17:26:17]

You might note the mystery of why this check exists, even if you have no
explanation.

+    LOG_GETLASTERROR(WARNING) << "tooltip creation failed, disabling tooltips";
+    tooltip_manager_.reset();
+  }
 
   // This message initializes the window so that focus border are shown for
   // windows.
   SendMessage(
       hwnd(), WM_CHANGEUISTATE, MAKELPARAM(UIS_CLEAR, UISF_HIDEFOCUS), 0);
 
   // Bug 964884: detach the IME attached to this window.
   // We should attach IMEs only when we need to input CJK strings.
   ImmAssociateContextEx(hwnd(), NULL, 0);
 
@@ skipping 296 matching lines @@
     DefWindowProc(GetNativeView(), WM_NCLBUTTONDOWN, w_param, l_param);
     SetMsgHandled(TRUE);
   }
   */
 
   MSG msg = { hwnd(), message, w_param, l_param, 0,
               { GET_X_LPARAM(l_param), GET_Y_LPARAM(l_param) } };
   MouseEvent event(msg);
 
   if (!(event.flags() & ui::EF_IS_NON_CLIENT))
-    tooltip_manager_->OnMouse(message, w_param, l_param);
+    if (tooltip_manager_.get())
+      tooltip_manager_->OnMouse(message, w_param, l_param);
 
   if (event.type() == ui::ET_MOUSE_MOVED && !HasMouseCapture()) {
     // Windows only fires WM_MOUSELEAVE events if the application begins
     // "tracking" mouse events for a given HWND during WM_MOUSEMOVE events.
     // We need to call |TrackMouseEvents| to listen for WM_MOUSELEAVE.
     TrackMouseEvents((message == WM_NCMOUSEMOVE) ?
         TME_NONCLIENT | TME_LEAVE : TME_LEAVE);
   } else if (event.type() == ui::ET_MOUSE_EXITED) {
     // Reset our tracking flags so future mouse movement over this
     // NativeWidgetWin results in a new tracking session. Fall through for
@@ skipping 988 matching lines @@
 
   // And now, notify them that they have a brand new parent.
   for (NativeWidgets::iterator it = widgets.begin();
        it != widgets.end(); ++it) {
     (*it)->GetWidget()->NotifyNativeViewHierarchyChanged(true,
                                                          new_parent);
   }
 }
 
 }  // namespace views