win: Add support for CPUTimes and StartTime to snapshot

util/win/time.h

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef CRASHPAD_UTIL_WIN_TIME_H_
 #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);
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_WIN_TIME_H_