gpu: Add a couple of unit-tests for GpuService.

gpu/ipc/service/gpu_watchdog_thread.cc

 // Copyright (c) 2012 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.
 
 #include "gpu/ipc/service/gpu_watchdog_thread.h"
 
 #include <errno.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/alias.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/power_monitor/power_monitor.h"
 #include "base/process/process.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
+#if defined(USE_X11)
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#endif
+
 namespace gpu {
 namespace {
 
 #if defined(CYGPROFILE_INSTRUMENTATION)
 const int kGpuTimeout = 30000;
 #elif defined(OS_WIN)
 // Use a slightly longer timeout on Windows due to prevalence of slow and
 // infected machines.
 const int kGpuTimeout = 15000;
 #else
@@ skipping 471 matching lines @@
     int tty_number;
     size_t num_res = sscanf(tty_string, "tty%d\n", &tty_number);
     if (num_res == 1)
       return tty_number;
   }
   return -1;
 }
 #endif
 
 }  // namespace gpu