Don't restart the GPU process when switching to another TTY

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/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 73 matching lines @@
   void OnAddPowerObserver();
 
   // Implement PowerObserver.
   void OnSuspend() override;
   void OnResume() override;
 
 #if defined(OS_WIN)
   base::ThreadTicks GetWatchedThreadTime();
 #endif
 
+#if defined(USE_X11)
+  int GetActiveTTY() const;
+#endif
+
   base::MessageLoop* watched_message_loop_;
   base::TimeDelta timeout_;
   volatile bool armed_;
   GpuWatchdogTaskObserver task_observer_;
 
   // True if the watchdog should wait for a certain amount of CPU to be used
   // before killing the process.
   bool use_thread_cpu_time_;
 
   // The number of consecutive acknowledgements that had a latency less than
@@ skipping 16 matching lines @@
   bool suspended_;
 
   // The time the last OnSuspend and OnResume was called.
   base::Time suspend_time_;
   base::Time resume_time_;
 
   // This is the time the last check was sent.
   base::Time check_time_;
   base::TimeTicks check_timeticks_;
 
-#if defined(OS_CHROMEOS)
-  FILE* tty_file_;
-#endif
-
 #if defined(USE_X11)
   XDisplay* display_;
   gfx::AcceleratedWidget window_;
   XAtom atom_;
+  FILE* tty_file_;
+  int host_tty_;
 #endif
 
   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_