win: Add support for CPUTimes and StartTime to snapshot

util/win/time.h

Index: util/win/time.h
diff --git a/util/win/time.h b/util/win/time.h
index e61a8461bf987c45fd38bc7452633529ae159c83..7cc0094f35e2d28d32c1acaf40e57ea533011a2b 100644
--- a/util/win/time.h
+++ b/util/win/time.h
@@ -16,9 +16,18 @@
 #define CRASHPAD_UTIL_WIN_TIME_H_
 
 #include <sys/time.h>
+#include <windows.h>
 
 namespace crashpad {
 
+//! \brief Convert Windows `FILETIME` to `timeval`, converting from Windows
+//!     epoch to POSIX epoch.
+timeval FiletimeToTimevalEpoch(const FILETIME& filetime);
+
+//! \brief Convert Windows `FILETIME` to `timeval`, treating the values as
+//!     an interval of elapsed time.
+timeval FiletimeToTimevalInterval(const FILETIME& filetime);
+
 //! \brief Similar to POSIX gettimeofday(), gets the current system time in UTC.
 void GetTimeOfDay(timeval* tv);