Linux: Build with xcb (Reland)

build/linux/system.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': {
     # If any of the linux_link_FOO below are set to 1, then the corresponding
     # target will be linked against the FOO library (either dynamically or
     # statically, depending on the pkg-config files), as opposed to loading the
     # FOO library dynamically with dlopen.
@@ skipping 215 matching lines @@
                   '<!@(<(pkg-config) --libs-only-L --libs-only-other x11 xi)',
                 ],
                 'libraries': [
                   '<!@(<(pkg-config) --libs-only-l x11 xi)',
                 ],
               },
             }],
           ],
         },
         {
+          'target_name': 'x11-xcb',
+          'type': 'none',
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(<(pkg-config) --cflags x11-xcb)',
+            ],
+          },
+          'link_settings': {
+            'ldflags': [
+              '<!@(<(pkg-config) --libs-only-L --libs-only-other x11-xcb)',
+            ],
+            'libraries': [
+              '<!@(<(pkg-config) --libs-only-l x11-xcb)',
+            ],
+          },
+        },
+        {
+          'target_name': 'xcb',
+          'type': 'none',
+          'direct_dependent_settings': {
+            'cflags': [
+              '<!@(<(pkg-config) --cflags xcb)',
+            ],
+          },
+          'link_settings': {
+            'ldflags': [
+              '<!@(<(pkg-config) --libs-only-L --libs-only-other xcb)',
+            ],
+            'libraries': [
+              '<!@(<(pkg-config) --libs-only-l xcb)',
+            ],
+          },
+        },
+        {
           'target_name': 'xcursor',
           'type': 'none',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags xcursor)',
             ],
           },
           'link_settings': {
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other xcursor)',
@@ skipping 1015 matching lines @@
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l libffi)',
             ],
           },
         }],
       ],
     },
   ],
 }