Add missing Xrandr library after r152519

ui/ui.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 548 matching lines @@
             '../build/linux/system.gyp:glib',
             '../build/linux/system.gyp:pangocairo',
             '../build/linux/system.gyp:x11',
             '../build/linux/system.gyp:xext',
             '../build/linux/system.gyp:xfixes',
           ],
           'link_settings': {
             'libraries': [
               '-lXcursor',  # For XCursor* function calls in x11_util.cc.
               '-lXrender',  # For XRender* function calls in x11_util.cc.
+              '-lXrandr',   # For XRR* function calls in x11_util.cc.
             ],
           },
           'conditions': [
             ['toolkit_views==0', {
               # Note: because of gyp predence rules this has to be defined as
               # 'sources/' rather than 'sources!'.
               'sources/': [
                 ['exclude', '^base/dragdrop/drag_drop_types_gtk.cc'],
                 ['exclude', '^base/dragdrop/drag_utils_gtk.cc'],
                 ['exclude', '^base/dragdrop/drag_utils.cc'],
@@ skipping 198 matching lines @@
   ],
   'conditions': [
     ['inside_chromium_build == 1 and OS != "ios"', {
       # TODO(ios): The ui tests do not compile yet on iOS.
       'includes': [
         'ui_unittests.gypi',
       ]},
     ],
   ],
 }