Update the gyp Linux build:

skia/skia.gyp

 # Copyright (c) 2009 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.
 
 {
   'includes': [
     '../build/common.gypi',
   ],
   'targets': [
     {
@@ skipping 669 matching lines @@
           ],
         }],
         [ 'OS != "win"', {
           'sources/': [ ['exclude', '_win\\.(cc|cpp)$'] ],
           'sources!': [
             'ext/vector_canvas.cc',
             'ext/vector_device.cc',
           ],
         }],
         [ 'OS == "linux"', {
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
           'cflags': [
             '-Wno-unused',
             '-Wno-unused-function',
           ],
           'sources!': [
             'ports/SkFontHost_none.cpp',
             'sgl/SkTypeface_fake.cpp',
           ],
         }],
         [ 'OS == "mac"', {
@@ skipping 19 matching lines @@
       'direct_dependent_settings': {
         'include_dirs': [
           'include',
           'include/corecg',
           'ext',
         ],
       },
     },
   ],
 }