Implement maxrss for Windows

tools/ProcStats.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "ProcStats.h"
 
 #if defined(SK_BUILD_FOR_UNIX) || \
     defined(SK_BUILD_FOR_MAC) || \
     defined(SK_BUILD_FOR_ANDROID)
 
     #include <sys/resource.h>
     int sk_tools::getMaxResidentSetSizeMB() {
         struct rusage ru;
         getrusage(RUSAGE_SELF, &ru);
     #if defined(SK_BUILD_FOR_MAC)
         return static_cast<int>(ru.ru_maxrss / 1024 / 1024);  // Darwin reports bytes.
     #else
         return static_cast<int>(ru.ru_maxrss / 1024);  // Linux reports kilobytes.
     #endif
     }
 
+#elif defined(SK_BUILD_FOR_WIN32)
+    #include <windows.h>
+    #include <psapi.h>
+    int sk_tools::getMaxResidentSetSizeMB() {
+        PROCESS_MEMORY_COUNTERS info;
+        GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
+        return static_cast<int>(info.PeakWorkingSetSize / 1024 / 1024);  // Windows reports bytes.
+    }
+
 #else
-
     int sk_tools::getMaxResidentSetSizeMB() {
         return -1;
     }
 
 #endif