More accurate implementation of watched thread time for Gpu Watchdog.

base/time/time.h

Index: base/time/time.h
diff --git a/base/time/time.h b/base/time/time.h
index 1989dbf8f27758e0643a3732859bcb62aca672c2..03bf4be154f4feb956f9d347ad58a2427a26a630 100644
--- a/base/time/time.h
+++ b/base/time/time.h
@@ -74,12 +74,12 @@
 // For FILETIME in FromFileTime, until it moves to a new converter class.
 // See TODO(iyengar) below.
 #include <windows.h>
-
 #include "base/gtest_prod_util.h"
 #endif
 
 namespace base {
 
+class PlatformThreadHandle;
 class TimeDelta;
 
 // The functions in the time_internal namespace are meant to be used only by the
@@ -749,6 +749,13 @@ class BASE_EXPORT ThreadTicks : public time_internal::TimeBase<ThreadTicks> {
   // absolutely needed, call WaitUntilInitialized() before this method.
   static ThreadTicks Now();
 
+#if defined(OS_WIN)
+  // Overload of Now() that returns thread-specific CPU time for an arbitrary
+  // thread. All comments for default version of Now() above apply to this
+  // method as well.
+  static ThreadTicks Now(const PlatformThreadHandle& thread_handle);
+#endif
+
  private:
   friend class time_internal::TimeBase<ThreadTicks>;