Fix some views unittests on desktop Linux.

ui/base/x/x11_util.h

 // 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.
 
 #ifndef UI_BASE_X_X11_UTIL_H_
 #define UI_BASE_X_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 244 matching lines @@
 };
 // Attempts to guess the window maager. Returns WM_UNKNOWN if we can't
 // determine it for one reason or another.
 UI_BASE_EXPORT WindowManagerName GuessWindowManager();
 
 // Enable the default X error handlers. These will log the error and abort
 // the process if called. Use SetX11ErrorHandlers() from x11_util_internal.h
 // to set your own error handlers.
 UI_BASE_EXPORT void SetDefaultX11ErrorHandlers();
 
-// Return true if a given window is in full-screen mode.
+// Returns true if a given window is in full-screen mode.
 UI_BASE_EXPORT bool IsX11WindowFullScreen(XID window);
 
+// Returns true if the window manager supports the given hint.
+UI_BASE_EXPORT bool WmSupportsHint(Atom atom);
+
 // Manages a piece of X11 allocated memory as a RefCountedMemory segment. This
 // object takes ownership over the passed in memory and will free it with the
 // X11 allocator when done.
 class UI_BASE_EXPORT XRefcountedMemory : public base::RefCountedMemory {
  public:
   XRefcountedMemory(unsigned char* x11_data, size_t length)
       : x11_data_(length ? x11_data : NULL), length_(length) {}
 
   // Overridden from RefCountedMemory:
   virtual const unsigned char* front() const OVERRIDE;
@@ skipping 66 matching lines @@
 UI_BASE_EXPORT void ResetXCursorCache();
 
 // Returns the cached XcursorImage for |cursor|.
 UI_BASE_EXPORT const XcursorImage* GetCachedXcursorImage(::Cursor cursor);
 
 }  // namespace test
 
 }  // namespace ui
 
 #endif  // UI_BASE_X_X11_UTIL_H_