Update the gyp Linux build:

base/base.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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 301 matching lines @@
       'conditions': [
         [ 'OS == "linux"', {
             'sources/': [ ['exclude', '_(mac|win)\\.cc$'],
                           ['exclude', '\\.mm?$' ] ],
             'sources!': [
               # Linux has an implementation of idle_timer that depends
               # on XScreenSaver, but it's unclear if we want it yet,
               # so use idle_timer_none.cc instead.
               'idle_timer.cc',
             ],
-            'cflags': ['-Wno-write-strings'],
+            'dependencies': [
+              '../build/linux/system.gyp:gtk',
+              '../build/linux/system.gyp:nss',
+            ],
+            'cflags': [
+              '-Wno-write-strings',
+            ],
+            'link_settings': {
+              'libraries': [
+                # We need rt for clock_gettime().
+                '-lrt',
+              ],
+            },
           },
           {  # else: OS != "linux"
             'sources!': [
               'atomicops_internals_x86_gcc.cc',
               'directory_watcher_inotify.cc',
               'hmac_nss.cc',
               'idle_timer_none.cc',
               'message_pump_glib.cc',
               'nss_init.cc',
               'time_posix.cc',
@@ skipping 96 matching lines @@
         'base',
         '../skia/skia.gyp:skia',
         '../third_party/libjpeg/libjpeg.gyp:libjpeg',
         '../third_party/libpng/libpng.gyp:libpng',
         '../third_party/zlib/zlib.gyp:zlib',
       ],
       'export_dependent_settings': [
         'base',
       ],
       'conditions': [
+        ['OS == "linux"', {
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
+        }],
         [ 'OS != "win"', { 'sources!': [
             'gfx/gdi_util.cc',
             'gfx/native_theme.cc',
             ],
         }],
         [ 'OS != "linux"', { 'sources!': [
             'gfx/gtk_util.cc',
             ],
         }],
       ],
@@ skipping 86 matching lines @@
         '../testing/gtest.gyp:gtest',
       ],
       'conditions': [
         ['OS == "linux"', {
           'sources!': [
             'file_version_info_unittest.cc',
             # Linux has an implementation of idle_timer, but it's unclear
             # if we want it yet, so leave it 'unported' for now.
             'idletimer_unittest.cc',
           ],
+          'dependencies': [
+            '../build/linux/system.gyp:gtk',
+          ],
         }],
         ['OS != "mac"', {
           'sources!': [
             'mac_util_unittest.cc',
           ],
         }],
         # This is needed to trigger the dll copy step on windows.
         # TODO(mark): This should not be necessary.
         ['OS == "win"', {
           'dependencies': [
@@ skipping 28 matching lines @@
       ],
       'sources': [
         'perftimer.cc',
         'run_all_perftests.cc',
       ],
       'direct_dependent_settings': {
         'defines': [
           'PERF_TEST',
         ],
       },
+      'conditions': [
+        ['OS == "linux"', {
+          'dependencies': [
+            # Needed to handle the #include chain:
+            #   base/perf_test_suite.h
+            #   base/test_suite.h
+            #   gtk/gtk.h
+            '../build/linux/system.gyp:gtk',
+          ],
+        }],
+      ],
     },
   ],
   'conditions': [
     [ 'OS == "win"', {
       'targets': [
         {
           'target_name': 'debug_message',
           'type': 'executable',
           'sources': [
             'debug_message.cc',
           ],
         },
       ],
     }],
   ],
 }