Two tab dragging fixes for various window managers:...

chrome/common/x11_util.h

 // Copyright (c) 2009 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_COMMON_X11_UTIL_H_
 #define CHROME_COMMON_X11_UTIL_H_
 
 // This file declares utility functions for X11 (Linux only).
 //
 // These functions do not require the Xlib headers to be included (which is why
@@ skipping 51 matching lines @@
 
 // Implementers of this interface receive a notification for every X window of
 // the main display.
 class EnumerateWindowsDelegate {
  public:
   // |xid| is the X Window ID of the enumerated window.  Return true to stop
   // further iteration.
   virtual bool ShouldStopIterating(XID xid) = 0;
 };
 
-// Enumerates all windows in the current display
-bool EnumerateAllWindows(EnumerateWindowsDelegate* delegate);
+// Enumerates all windows in the current display.  Will recurse into child
+// windows up to a depth of |max_depth|.
+bool EnumerateAllWindows(EnumerateWindowsDelegate* delegate, int max_depth);
 
 // Return a handle to a server side pixmap. |shared_memory_key| is a SysV
 // IPC key. The shared memory region must contain 32-bit pixels.
 XID AttachSharedMemory(Display* display, int shared_memory_support);
 void DetachSharedMemory(Display* display, XID shmseg);
 
 // Return a handle to an XRender picture where |pixmap| is a handle to a
 // pixmap containing Skia ARGB data.
 XID CreatePictureFromSkiaPixmap(Display* display, XID pixmap);
 
@@ skipping 19 matching lines @@
 
 // Find the immediate parent of an X window.
 //
 // parent_window: (output) the parent window of |window|, or 0.
 // parent_is_root: (output) true iff the parent of |window| is the root window.
 bool GetWindowParent(XID* parent_window, bool* parent_is_root, XID window);
 
 }  // namespace x11_util
 
 #endif  // CHROME_COMMON_X11_UTIL_H_