Avoid gpu watchdog crash on timeout if X is un-responsive.

content/gpu/gpu_watchdog_thread.h

 // 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.
 
 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/power_monitor/power_observer.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "content/common/gpu/gpu_watchdog.h"
+#include "ui/gfx/native_widget_types.h"
+
+#if defined(USE_X11)
+extern "C" {
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+}
+#include <sys/poll.h>
+#include "ui/base/x/x11_util.h"
+#include "ui/gfx/x/x11_types.h"
+
+#endif
 
 namespace content {
 
 // A thread that intermitently sends tasks to a group of watched message loops
 // and deliberately crashes if one of them does not respond after a timeout.
 class GpuWatchdogThread : public base::Thread,
                           public GpuWatchdog,
                           public base::PowerObserver,
                           public base::RefCountedThreadSafe<GpuWatchdogThread> {
  public:
@@ skipping 30 matching lines @@
 
    private:
     GpuWatchdogThread* watchdog_;
   };
 
   ~GpuWatchdogThread() override;
 
   void OnAcknowledge();
   void OnCheck(bool after_suspend);
   void DeliberatelyTerminateToRecoverFromHang();
+#if defined(USE_X11)
+  void SetupXServer();
+  void SetupXChangeProp();
+  bool MatchXEventAtom(XEvent* event);
+#endif
 
   void OnAddPowerObserver();
 
   // Implement PowerObserver.
   void OnSuspend() override;
   void OnResume() override;
 
 #if defined(OS_WIN)
   base::TimeDelta GetWatchedThreadTime();
 #endif
@@ skipping 11 matching lines @@
   // Time after which it's assumed that the computer has been suspended since
   // the task was posted.
   base::Time suspension_timeout_;
 
   bool suspended_;
 
 #if defined(OS_CHROMEOS)
   FILE* tty_file_;
 #endif
 
+#if defined(USE_X11)
+  XDisplay* display_;
+  gfx::AcceleratedWidget window_;
+  XAtom atom_;
+#endif
+
   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_