GPU Watchdog to check I/O before terminating GPU process

content/gpu/gpu_watchdog_thread.h

Index: content/gpu/gpu_watchdog_thread.h
diff --git a/content/gpu/gpu_watchdog_thread.h b/content/gpu/gpu_watchdog_thread.h
index c8e00952b26bf8e6c6fe717b02d054bc12574dc9..0861adfdc4112d1a4e92aadb513404d52e95322b 100644
--- a/content/gpu/gpu_watchdog_thread.h
+++ b/content/gpu/gpu_watchdog_thread.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
 
+#include "base/files/file.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ -74,6 +75,7 @@ class GpuWatchdogThread : public base::Thread,
 
   void OnAcknowledge();
   void OnCheck(bool after_suspend);
+  void BeginTerminating();
   void DeliberatelyTerminateToRecoverFromHang();
 #if defined(USE_X11)
   void SetupXServer();
@@ -127,6 +129,12 @@ class GpuWatchdogThread : public base::Thread,
   base::Time check_time_;
   base::TimeTicks check_timeticks_;
 
+  // Writing to this temp file is used as an additional step before crashing the
+  // process. That should help to distinguish true hangs from the cases when the
+  // watched thread is running slow being blocked on hard faults or other I/O.
+  base::File temp_file_for_io_checking_;
+  base::TimeDelta io_check_duration_;
+
 #if defined(OS_CHROMEOS)
   FILE* tty_file_;
 #endif