Make it possible to disable udev in linux

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 67f6271a8b92f5999bcd123b95262b66bcd1edaa..c1fba8004d44cdb4e5df407db0aefb38f3eb6afa 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -448,6 +448,13 @@
           'use_nss%': 0,
         }],
 
+        # libudev usage.
+        ['OS=="linux"', {
+          'use_udev%': 1,
+        }, {
+          'use_udev%': 0,
+        }],
+
         # Flags to use X11 on non-Mac POSIX platforms
         ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android"', {
           'use_glib%': 0,
@@ -680,6 +687,7 @@
     'use_ash%': '<(use_ash)',
     'use_openssl%': '<(use_openssl)',
     'use_nss%': '<(use_nss)',
+    'use_udev%': '<(use_udev)',
     'os_bsd%': '<(os_bsd)',
     'os_posix%': '<(os_posix)',
     'use_glib%': '<(use_glib)',