enable RenderViewTest.OnHandleKeyboardEvent on Linux.

base/base.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 53 matching lines @@
           'dir_reader_fallback.h',
           'dir_reader_linux.h',
           'dir_reader_posix.h',
           'env_var.cc',
           'env_var.h',
           'event_trace_consumer_win.h',
           'event_trace_controller_win.cc',
           'event_trace_controller_win.h',
           'event_trace_provider_win.cc',
           'event_trace_provider_win.h',
+          'event_synthesis_gtk.cc',
+          'event_synthesis_gtk.h',
           'file_path.cc',
           'file_path.h',
           'file_util.cc',
           'file_util.h',
           'file_util_deprecated.h',
           'file_util_mac.mm',
           'file_util_posix.cc',
           'file_util_win.cc',
           'file_version_info.h',
           'file_version_info_mac.h',
@@ skipping 608 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }