Linux: Build with xcb (Reland)

build/linux/system.gyp

Index: build/linux/system.gyp
diff --git a/build/linux/system.gyp b/build/linux/system.gyp
index 9d0c6b68698848410ff498f43736e509d01f3ab1..09ccddd20a1436de852d6f88d4de5de1683deded 100644
--- a/build/linux/system.gyp
+++ b/build/linux/system.gyp
@@ -233,6 +233,40 @@
           ],
         },
         {
+          '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': {