Don't reserve space for an auto-hide taskbar that's not always-on-top. Windo...

chrome/common/win_util.cc

 // Copyright (c) 2006-2008 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/common/win_util.h"
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <commdlg.h>
 #include <dwmapi.h>
@@ skipping 550 matching lines @@
       SetWindowPos(window, 0, window_bounds.left, window_bounds.top,
                    window_bounds.right - window_bounds.left,
                    window_bounds.bottom - window_bounds.top,
                    SWP_NOACTIVATE | SWP_NOZORDER);
     }  // else case, AdjustWindowToFit set the bounds for us.
   } else {
     NOTREACHED() << "Unable to adjust window to fit";
   }
 }
 
-bool EdgeHasAutoHideTaskbar(UINT edge, HMONITOR monitor) {
+bool EdgeHasTopmostAutoHideTaskbar(UINT edge, HMONITOR monitor) {
   APPBARDATA taskbar_data = { 0 };
   taskbar_data.cbSize = sizeof APPBARDATA;
   taskbar_data.uEdge = edge;
   HWND taskbar = reinterpret_cast<HWND>(SHAppBarMessage(ABM_GETAUTOHIDEBAR,
                                                         &taskbar_data));
   return ::IsWindow(taskbar) &&
-      (MonitorFromWindow(taskbar, MONITOR_DEFAULTTONEAREST) == monitor);
+      (MonitorFromWindow(taskbar, MONITOR_DEFAULTTONULL) == monitor) &&
+      (GetWindowLong(taskbar, GWL_EXSTYLE) & WS_EX_TOPMOST);
 }
 
 HANDLE GetSectionFromProcess(HANDLE section, HANDLE process, bool read_only) {
   HANDLE valid_section = NULL;
   DWORD access = STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ;
   if (!read_only)
     access |= FILE_MAP_WRITE;
   DuplicateHandle(process, section, GetCurrentProcess(), &valid_section, access,
                   FALSE, 0);
   return valid_section;
@@ skipping 262 matching lines @@
 }
 
 ChromeFont GetWindowTitleFont() {
   NONCLIENTMETRICS ncm;
   win_util::GetNonClientMetrics(&ncm);
   ScopedHFONT caption_font(CreateFontIndirect(&(ncm.lfCaptionFont)));
   return ChromeFont::CreateFont(caption_font);
 }
 
 }  // namespace win_util